[MSC] Porting GenerateStreams clients to handle stream vectors.

The getDisplayMedia implementation currently only handles single
streams. This CL ports several GenerateStreams clients to handle
multiple streams.

Bug: 1300883
Change-Id: I764cb74b9a6fd66929ee7ebc741800968d0be503
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3560567
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Henrik Boström <hbos@chromium.org>
Reviewed-by: Sean Topping <seantopping@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Reviewed-by: Michael Bai <michaelbai@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Simon Hangl <simonha@google.com>
Reviewed-by: Elad Alon <eladalon@chromium.org>
Reviewed-by: Carlos Knippschild <carlosk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1012407}

android_webview/browser/aw_web_contents_delegate.cc

@@ -257,7 +257,7 @@ void AwWebContentsDelegate::RequestMediaAccessPermission(
   AwContents* aw_contents = AwContents::FromWebContents(web_contents);
   if (!aw_contents) {
     std::move(callback).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::FAILED_DUE_TO_SHUTDOWN,
         nullptr);
     return;

android_webview/browser/permission/media_access_permission_request.cc

@@ -4,6 +4,7 @@
 
 #include "android_webview/browser/permission/media_access_permission_request.h"
 
+#include <algorithm>
 #include <utility>
 
 #include "android_webview/browser/permission/aw_permission_request.h"
@@ -48,14 +49,18 @@ MediaAccessPermissionRequest::~MediaAccessPermissionRequest() {}
 
 void MediaAccessPermissionRequest::NotifyRequestResult(bool allowed) {
   std::unique_ptr<content::MediaStreamUI> ui;
-  blink::mojom::StreamDevices devices;
   if (!allowed) {
     std::move(callback_).Run(
-        devices, blink::mojom::MediaStreamRequestResult::PERMISSION_DENIED,
+        blink::mojom::StreamDevicesSet(),
+        blink::mojom::MediaStreamRequestResult::PERMISSION_DENIED,
         std::move(ui));
     return;
   }
 
+  blink::mojom::StreamDevicesSet stream_devices_set;
+  stream_devices_set.stream_devices.emplace_back(
+      blink::mojom::StreamDevices::New());
+  blink::mojom::StreamDevices& devices = *stream_devices_set.stream_devices[0];
   if (request_.audio_type ==
       blink::mojom::MediaStreamType::DEVICE_AUDIO_CAPTURE) {
     const MediaStreamDevices& audio_devices =
@@ -79,11 +84,16 @@ void MediaAccessPermissionRequest::NotifyRequestResult(bool allowed) {
     if (device)
       devices.video_device = *device;
   }
+
+  const bool has_no_hardware =
+      !devices.audio_device.has_value() && !devices.video_device.has_value();
+  if (has_no_hardware) {
+    stream_devices_set.stream_devices.clear();
+  }
   std::move(callback_).Run(
-      devices,
-      (!devices.audio_device.has_value() && !devices.video_device.has_value())
-          ? blink::mojom::MediaStreamRequestResult::NO_HARDWARE
-          : blink::mojom::MediaStreamRequestResult::OK,
+      stream_devices_set,
+      has_no_hardware ? blink::mojom::MediaStreamRequestResult::NO_HARDWARE
+                      : blink::mojom::MediaStreamRequestResult::OK,
       std::move(ui));
 }
 

android_webview/browser/permission/media_access_permission_request_unittest.cc

@@ -80,10 +80,10 @@ class MediaAccessPermissionRequestTest : public testing::Test {
   blink::mojom::MediaStreamRequestResult result_;
 
  private:
-  void Callback(const blink::mojom::StreamDevices& devices,
+  void Callback(const blink::mojom::StreamDevicesSet& stream_devices_set,
                 blink::mojom::MediaStreamRequestResult result,
                 std::unique_ptr<content::MediaStreamUI> ui) {
-    devices_ = blink::StreamDevicesToMediaStreamDevicesList(devices);
+    devices_ = blink::ToMediaStreamDevicesList(stream_devices_set);
     result_ = result;
   }
 };

chrome/browser/ash/policy/dlp/dlp_content_manager_ash_browsertest.cc

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "base/test/bind.h"
 #include "chrome/browser/ash/policy/dlp/dlp_content_manager_ash.h"
 
 #include <functional>
@@ -54,6 +55,7 @@
 #include "content/public/test/browser_test.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/abseil-cpp/absl/types/optional.h"
+#include "third_party/blink/public/mojom/mediastream/media_stream.mojom-forward.h"
 #include "third_party/blink/public/mojom/mediastream/media_stream.mojom-shared.h"
 #include "ui/aura/window.h"
 #include "ui/gfx/geometry/rect.h"
@@ -874,23 +876,27 @@ class DlpContentManagerAshScreenShareBrowserTest
                              bool expect_warning) {
     // First check for the permission to start screen sharing.
     // It should call DlpContentManager::CheckScreenShareRestriction().
-    base::test::TestFuture<const blink::mojom::StreamDevices&,
-                           blink::mojom::MediaStreamRequestResult,
-                           std::unique_ptr<content::MediaStreamUI>>
-        test_future;
+    blink::mojom::MediaStreamRequestResult received_result =
+        blink::mojom::MediaStreamRequestResult::NUM_MEDIA_REQUEST_RESULTS;
+    base::RunLoop run_loop;
     handler->HandleRequest(
         web_contents, request,
-        test_future.GetCallback<const blink::mojom::StreamDevices&,
-                                blink::mojom::MediaStreamRequestResult,
-                                std::unique_ptr<content::MediaStreamUI>>(),
+        base::BindLambdaForTesting(
+            [&received_result, &run_loop](
+                const blink::mojom::StreamDevicesSet&,
+                blink::mojom::MediaStreamRequestResult result,
+                std::unique_ptr<content::MediaStreamUI>) {
+              received_result = result;
+              run_loop.Quit();
+            }),
         /*extension=*/nullptr);
 
     if (expect_warning)
       DismissDialog(expect_allowed);
 
-    ASSERT_TRUE(test_future.Wait()) << "MediaResponseCallback timed out.";
+    run_loop.Run();
     EXPECT_EQ(
-        test_future.Get<1>(),
+        received_result,
         (expect_allowed
              ? blink::mojom::MediaStreamRequestResult::OK
              : blink::mojom::MediaStreamRequestResult::PERMISSION_DENIED));

chrome/browser/media/media_access_handler.cc

@@ -30,7 +30,12 @@ void MediaAccessHandler::CheckDevicesAndRunCallback(
   bool get_default_audio_device = audio_allowed;
   bool get_default_video_device = video_allowed;
 
-  blink::mojom::StreamDevices stream_devices;
+  // TOOD(crbug.com/1300883): Generalize to multiple streams.
+  blink::mojom::StreamDevicesSet stream_devices_set;
+  stream_devices_set.stream_devices.emplace_back(
+      blink::mojom::StreamDevices::New());
+  blink::mojom::StreamDevices& stream_devices =
+      *stream_devices_set.stream_devices[0];
 
   // Set an initial error result. If neither audio or video is allowed, we'll
   // never try to get any device below but will just create |ui| and return an
@@ -85,5 +90,10 @@ void MediaAccessHandler::CheckDevicesAndRunCallback(
              ->RegisterMediaStream(web_contents, stream_devices);
   }
 
-  std::move(callback).Run(stream_devices, result, std::move(ui));
+  if (!stream_devices.audio_device.has_value() &&
+      !stream_devices.video_device.has_value()) {
+    stream_devices_set.stream_devices.clear();
+  }
+
+  std::move(callback).Run(stream_devices_set, result, std::move(ui));
 }

chrome/browser/media/offscreen_tab.cc

@@ -334,7 +334,7 @@ void OffscreenTab::RequestMediaAccessPermission(
     WebContents* contents,
     const content::MediaStreamRequest& request,
     content::MediaResponseCallback callback) {
-  std::move(callback).Run(blink::mojom::StreamDevices(),
+  std::move(callback).Run(blink::mojom::StreamDevicesSet(),
                           blink::mojom::MediaStreamRequestResult::NOT_SUPPORTED,
                           nullptr);
 }

chrome/browser/media/webrtc/desktop_capture_access_handler.cc

@@ -253,7 +253,7 @@ void DesktopCaptureAccessHandler::ProcessScreenCaptureAccessRequest(
 
   if (!screen_capture_enabled || !origin_is_secure) {
     std::move(pending_request->callback)
-        .Run(blink::mojom::StreamDevices(),
+        .Run(blink::mojom::StreamDevicesSet(),
              blink::mojom::MediaStreamRequestResult::INVALID_STATE,
              /*ui=*/nullptr);
     return;
@@ -262,7 +262,7 @@ void DesktopCaptureAccessHandler::ProcessScreenCaptureAccessRequest(
   if (!IsRequestApproved(web_contents, pending_request->request, extension,
                          pending_request->is_allowlisted_extension)) {
     std::move(pending_request->callback)
-        .Run(blink::mojom::StreamDevices(),
+        .Run(blink::mojom::StreamDevicesSet(),
              blink::mojom::MediaStreamRequestResult::PERMISSION_DENIED,
              /*ui=*/nullptr);
     return;
@@ -273,7 +273,7 @@ void DesktopCaptureAccessHandler::ProcessScreenCaptureAccessRequest(
               pending_request->request.render_process_id,
               pending_request->request.render_frame_id))) {
     std::move(pending_request->callback)
-        .Run(blink::mojom::StreamDevices(),
+        .Run(blink::mojom::StreamDevicesSet(),
              blink::mojom::MediaStreamRequestResult::INVALID_STATE,
              /*ui=*/nullptr);
     return;
@@ -351,7 +351,7 @@ void DesktopCaptureAccessHandler::HandleRequest(
   if (request.video_type !=
       blink::mojom::MediaStreamType::GUM_DESKTOP_VIDEO_CAPTURE) {
     std::move(pending_request->callback)
-        .Run(blink::mojom::StreamDevices(),
+        .Run(blink::mojom::StreamDevicesSet(),
              blink::mojom::MediaStreamRequestResult::INVALID_STATE,
              /*ui=*/nullptr);
     return;
@@ -363,7 +363,7 @@ void DesktopCaptureAccessHandler::HandleRequest(
 
   if (allowed_capture_level == AllowedScreenCaptureLevel::kDisallowed) {
     std::move(pending_request->callback)
-        .Run(blink::mojom::StreamDevices(),
+        .Run(blink::mojom::StreamDevicesSet(),
              blink::mojom::MediaStreamRequestResult::PERMISSION_DENIED,
              /*ui=*/nullptr);
     return;
@@ -379,7 +379,7 @@ void DesktopCaptureAccessHandler::HandleRequest(
   if (request.requested_video_device_id.empty()) {
     if (allowed_capture_level < AllowedScreenCaptureLevel::kDesktop) {
       std::move(pending_request->callback)
-          .Run(blink::mojom::StreamDevices(),
+          .Run(blink::mojom::StreamDevicesSet(),
                blink::mojom::MediaStreamRequestResult::PERMISSION_DENIED,
                /*ui=*/nullptr);
       return;
@@ -388,7 +388,7 @@ void DesktopCaptureAccessHandler::HandleRequest(
     if (system_media_permissions::CheckSystemScreenCapturePermission() !=
         system_media_permissions::SystemPermission::kAllowed) {
       std::move(pending_request->callback)
-          .Run(blink::mojom::StreamDevices(),
+          .Run(blink::mojom::StreamDevicesSet(),
                blink::mojom::MediaStreamRequestResult::SYSTEM_PERMISSION_DENIED,
                /*ui=*/nullptr);
       return;
@@ -423,7 +423,7 @@ void DesktopCaptureAccessHandler::HandleRequest(
   // Received invalid device id.
   if (media_id.type == content::DesktopMediaID::TYPE_NONE) {
     std::move(pending_request->callback)
-        .Run(blink::mojom::StreamDevices(),
+        .Run(blink::mojom::StreamDevicesSet(),
              blink::mojom::MediaStreamRequestResult::INVALID_STATE,
              /*ui=*/nullptr);
     return;
@@ -431,7 +431,7 @@ void DesktopCaptureAccessHandler::HandleRequest(
 
   if (!IsMediaTypeAllowed(allowed_capture_level, media_id.type)) {
     std::move(pending_request->callback)
-        .Run(blink::mojom::StreamDevices(),
+        .Run(blink::mojom::StreamDevicesSet(),
              blink::mojom::MediaStreamRequestResult::PERMISSION_DENIED,
              /*ui=*/nullptr);
     return;
@@ -441,7 +441,7 @@ void DesktopCaptureAccessHandler::HandleRequest(
       system_media_permissions::CheckSystemScreenCapturePermission() !=
           system_media_permissions::SystemPermission::kAllowed) {
     std::move(pending_request->callback)
-        .Run(blink::mojom::StreamDevices(),
+        .Run(blink::mojom::StreamDevicesSet(),
              blink::mojom::MediaStreamRequestResult::SYSTEM_PERMISSION_DENIED,
              /*ui=*/nullptr);
     return;
@@ -454,7 +454,7 @@ void DesktopCaptureAccessHandler::HandleRequest(
               media_id.web_contents_id.render_process_id,
               media_id.web_contents_id.main_render_frame_id))) {
     std::move(pending_request->callback)
-        .Run(blink::mojom::StreamDevices(),
+        .Run(blink::mojom::StreamDevicesSet(),
              blink::mojom::MediaStreamRequestResult::TAB_CAPTURE_FAILURE,
              /*ui=*/nullptr);
     return;
@@ -489,7 +489,7 @@ void DesktopCaptureAccessHandler::ProcessChangeSourceRequest(
     pending_request->picker = picker_factory_->CreatePicker();
     if (!pending_request->picker) {
       std::move(pending_request->callback)
-          .Run(blink::mojom::StreamDevices(),
+          .Run(blink::mojom::StreamDevicesSet(),
                blink::mojom::MediaStreamRequestResult::INVALID_STATE,
                /*ui=*/nullptr);
       return;
@@ -614,7 +614,7 @@ void DesktopCaptureAccessHandler::OnPickerDialogResults(
 
   if (media_id.is_null()) {
     std::move(pending_request->callback)
-        .Run(blink::mojom::StreamDevices(),
+        .Run(blink::mojom::StreamDevicesSet(),
              blink::mojom::MediaStreamRequestResult::PERMISSION_DENIED,
              /*ui=*/nullptr);
   } else {
@@ -670,19 +670,26 @@ void DesktopCaptureAccessHandler::AcceptRequest(
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   DCHECK(web_contents);
 
-  blink::mojom::StreamDevices devices;
+  // TODO(crbug.com/1300883): Generalize to multiple streams.
+  blink::mojom::StreamDevicesSet stream_devices_set;
+  stream_devices_set.stream_devices.emplace_back(
+      blink::mojom::StreamDevices::New());
+  blink::mojom::StreamDevices& stream_devices =
+      *stream_devices_set.stream_devices[0];
   std::unique_ptr<content::MediaStreamUI> ui = GetDevicesForDesktopCapture(
       pending_request->request, web_contents, media_id, capture_audio,
       pending_request->request.disable_local_echo,
       pending_request->should_display_notification,
-      pending_request->application_title, devices);
-  DCHECK(devices.audio_device.has_value() || devices.video_device.has_value());
+      pending_request->application_title, stream_devices);
+  DCHECK(stream_devices.audio_device.has_value() ||
+         stream_devices.video_device.has_value());
 
   UpdateExtensionTrusted(pending_request->request,
                          pending_request->is_allowlisted_extension);
 
   std::move(pending_request->callback)
-      .Run(devices, blink::mojom::MediaStreamRequestResult::OK, std::move(ui));
+      .Run(stream_devices_set, blink::mojom::MediaStreamRequestResult::OK,
+           std::move(ui));
 }
 
 #if BUILDFLAG(IS_CHROMEOS)
@@ -702,7 +709,7 @@ void DesktopCaptureAccessHandler::OnDlpRestrictionChecked(
 
   if (!is_dlp_allowed) {
     std::move(pending_request->callback)
-        .Run(blink::mojom::StreamDevices(),
+        .Run(blink::mojom::StreamDevicesSet(),
              blink::mojom::MediaStreamRequestResult::PERMISSION_DENIED,
              /*ui=*/nullptr);
     return;

chrome/browser/media/webrtc/desktop_capture_access_handler_unittest.cc

@@ -86,11 +86,17 @@ class DesktopCaptureAccessHandlerTest : public ChromeRenderViewHostTestHarness {
         [](base::RunLoop* wait_loop, bool expect_result,
            blink::mojom::MediaStreamRequestResult* request_result,
            blink::mojom::StreamDevices* devices_result,
-           const blink::mojom::StreamDevices& devices,
+           const blink::mojom::StreamDevicesSet& stream_devices_set,
            blink::mojom::MediaStreamRequestResult result,
            std::unique_ptr<content::MediaStreamUI> ui) {
           *request_result = result;
-          *devices_result = devices;
+          if (result == blink::mojom::MediaStreamRequestResult::OK) {
+            ASSERT_EQ(stream_devices_set.stream_devices.size(), 1u);
+            *devices_result = *stream_devices_set.stream_devices[0];
+          } else {
+            ASSERT_TRUE(stream_devices_set.stream_devices.empty());
+            *devices_result = blink::mojom::StreamDevices();
+          }
           EXPECT_TRUE(expect_result) << "MediaResponseCallback should not be "
                                         "called when expect_result is false.";
           wait_loop->Quit();
@@ -131,12 +137,16 @@ class DesktopCaptureAccessHandlerTest : public ChromeRenderViewHostTestHarness {
     content::MediaResponseCallback callback = base::BindOnce(
         [](base::RunLoop* wait_loop,
            blink::mojom::MediaStreamRequestResult* request_result,
-           blink::mojom::StreamDevices* stream_devices_result,
-           const blink::mojom::StreamDevices& devices,
+           blink::mojom::StreamDevices* devices_result,
+           const blink::mojom::StreamDevicesSet& stream_devices_set,
            blink::mojom::MediaStreamRequestResult result,
            std::unique_ptr<content::MediaStreamUI> ui) {
           *request_result = result;
-          *stream_devices_result = devices;
+          if (!stream_devices_set.stream_devices.empty()) {
+            *devices_result = *stream_devices_set.stream_devices[0];
+          } else {
+            *devices_result = blink::mojom::StreamDevices();
+          }
           wait_loop->Quit();
         },
         &wait_loop, request_result, stream_devices_result);
@@ -306,12 +316,12 @@ TEST_F(DesktopCaptureAccessHandlerTest, ChangeSourceMultipleRequests) {
         [](base::RunLoop* wait_loop,
            blink::mojom::MediaStreamRequestResult* request_result,
            blink::MediaStreamDevices* devices_result,
-           const blink::mojom::StreamDevices& devices,
+           const blink::mojom::StreamDevicesSet& stream_devices_set,
            blink::mojom::MediaStreamRequestResult result,
            std::unique_ptr<content::MediaStreamUI> ui) {
+          ASSERT_EQ(stream_devices_set.stream_devices.size(), 1u);
           *request_result = result;
-          *devices_result =
-              blink::StreamDevicesToMediaStreamDevicesList(devices);
+          *devices_result = blink::ToMediaStreamDevicesList(stream_devices_set);
           wait_loop->Quit();
         },
         &loop, &result, &devices);

chrome/browser/media/webrtc/display_media_access_handler.cc

@@ -101,7 +101,7 @@ void DisplayMediaAccessHandler::HandleRequest(
                                              web_contents) ==
       AllowedScreenCaptureLevel::kDisallowed) {
     std::move(callback).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::PERMISSION_DENIED,
         /*ui=*/nullptr);
     return;
@@ -116,7 +116,7 @@ void DisplayMediaAccessHandler::HandleRequest(
           web_contents);
   if (observer) {
     std::move(callback).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::PERMISSION_DENIED,
         /*ui=*/nullptr);
     observer->OnDesktopCaptureRequest();
@@ -133,7 +133,7 @@ void DisplayMediaAccessHandler::HandleRequest(
       request.request_type != blink::MEDIA_DEVICE_UPDATE) {
     LOG(ERROR) << "Do not allow getDisplayMedia() on a backgrounded page.";
     std::move(callback).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::INVALID_STATE, /*ui=*/nullptr);
     return;
   }
@@ -159,7 +159,7 @@ void DisplayMediaAccessHandler::HandleRequest(
         request.render_process_id, request.render_frame_id);
     if (!rfh) {
       std::move(callback).Run(
-          blink::mojom::StreamDevices(),
+          blink::mojom::StreamDevicesSet(),
           blink::mojom::MediaStreamRequestResult::INVALID_STATE,
           /*ui=*/nullptr);
       return;
@@ -179,7 +179,7 @@ void DisplayMediaAccessHandler::HandleRequest(
             rfh->GetProcess(), bad_message::BadMessageReason::
                                    RFH_DISPLAY_CAPTURE_PERMISSION_MISSING);
         std::move(callback).Run(
-            blink::mojom::StreamDevices(),
+            blink::mojom::StreamDevicesSet(),
             blink::mojom::MediaStreamRequestResult::PERMISSION_DENIED,
             /*ui=*/nullptr);
         return;
@@ -190,7 +190,7 @@ void DisplayMediaAccessHandler::HandleRequest(
   std::unique_ptr<DesktopMediaPicker> picker = picker_factory_->CreatePicker();
   if (!picker) {
     std::move(callback).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::INVALID_STATE, /*ui=*/nullptr);
     return;
   }
@@ -371,7 +371,7 @@ void DisplayMediaAccessHandler::RejectRequest(
     return;
   PendingAccessRequest& mutable_request = *mutable_queue.front();
   std::move(mutable_request.callback)
-      .Run(blink::mojom::StreamDevices(), result, /*ui=*/nullptr);
+      .Run(blink::mojom::StreamDevicesSet(), result, /*ui=*/nullptr);
   mutable_queue.pop_front();
   if (!mutable_queue.empty())
     ProcessQueuedAccessRequest(mutable_queue, web_contents);
@@ -398,15 +398,20 @@ void DisplayMediaAccessHandler::AcceptRequest(
       (media_id.type == content::DesktopMediaID::TYPE_WEB_CONTENTS) &&
       media_id.web_contents_id.disable_local_echo;
 
-  blink::mojom::StreamDevices devices;
+  blink::mojom::StreamDevicesSet stream_devices_set;
+  stream_devices_set.stream_devices.emplace_back(
+      blink::mojom::StreamDevices::New());
+  blink::mojom::StreamDevices& stream_devices =
+      *stream_devices_set.stream_devices[0];
   std::unique_ptr<content::MediaStreamUI> ui = GetDevicesForDesktopCapture(
       pending_request.request, web_contents, media_id, media_id.audio_share,
       disable_local_echo, display_notification_,
-      GetApplicationTitle(web_contents), devices);
+      GetApplicationTitle(web_contents), stream_devices);
   UpdateTarget(pending_request.request, media_id);
 
   std::move(pending_request.callback)
-      .Run(devices, blink::mojom::MediaStreamRequestResult::OK, std::move(ui));
+      .Run(stream_devices_set, blink::mojom::MediaStreamRequestResult::OK,
+           std::move(ui));
   queue.pop_front();
 
   if (!queue.empty())

chrome/browser/media/webrtc/display_media_access_handler_unittest.cc

@@ -97,11 +97,17 @@ class DisplayMediaAccessHandlerTest : public ChromeRenderViewHostTestHarness {
         [](base::RunLoop* wait_loop,
            blink::mojom::MediaStreamRequestResult* request_result,
            blink::mojom::StreamDevices* devices_result,
-           const blink::mojom::StreamDevices& devices,
+           const blink::mojom::StreamDevicesSet& stream_devices_set,
            blink::mojom::MediaStreamRequestResult result,
            std::unique_ptr<content::MediaStreamUI> ui) {
           *request_result = result;
-          *devices_result = devices;
+          if (result == blink::mojom::MediaStreamRequestResult::OK) {
+            ASSERT_EQ(stream_devices_set.stream_devices.size(), 1u);
+            *devices_result = *stream_devices_set.stream_devices[0];
+          } else {
+            ASSERT_TRUE(stream_devices_set.stream_devices.empty());
+            *devices_result = blink::mojom::StreamDevices();
+          }
           wait_loop->Quit();
         },
         wait_loop, request_result, &devices_result);
@@ -508,12 +514,17 @@ TEST_F(DisplayMediaAccessHandlerTest, MultipleRequests) {
         [](base::RunLoop* wait_loop,
            blink::mojom::MediaStreamRequestResult* request_result,
            blink::MediaStreamDevices* devices_result,
-           const blink::mojom::StreamDevices& devices,
+           const blink::mojom::StreamDevicesSet& stream_devices_set,
            blink::mojom::MediaStreamRequestResult result,
            std::unique_ptr<content::MediaStreamUI> ui) {
           *request_result = result;
-          *devices_result =
-              blink::StreamDevicesToMediaStreamDevicesList(devices);
+          if (result == blink::mojom::MediaStreamRequestResult::OK) {
+            ASSERT_EQ(stream_devices_set.stream_devices.size(), 1u);
+            *devices_result =
+                blink::ToMediaStreamDevicesList(stream_devices_set);
+          } else {
+            ASSERT_TRUE(stream_devices_set.stream_devices.empty());
+          }
           wait_loop->Quit();
         },
         &wait_loop[i], &result, &devices);

chrome/browser/media/webrtc/media_capture_devices_dispatcher.cc

@@ -150,7 +150,7 @@ void MediaCaptureDevicesDispatcher::ProcessMediaAccessRequest(
           blink::mojom::MediaStreamType::DISPLAY_VIDEO_CAPTURE &&
       !base::FeatureList::IsEnabled(features::kUserMediaScreenCapturing)) {
     std::move(callback).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::NOT_SUPPORTED, nullptr);
     return;
   }
@@ -166,7 +166,7 @@ void MediaCaptureDevicesDispatcher::ProcessMediaAccessRequest(
       return;
     }
   }
-  std::move(callback).Run(blink::mojom::StreamDevices(),
+  std::move(callback).Run(blink::mojom::StreamDevicesSet(),
                           blink::mojom::MediaStreamRequestResult::NOT_SUPPORTED,
                           nullptr);
 }

chrome/browser/media/webrtc/media_stream_devices_controller_browsertest.cc

@@ -40,6 +40,7 @@
 #include "content/public/test/mock_render_process_host.h"
 #include "extensions/common/constants.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "third_party/blink/public/common/mediastream/media_stream_request.h"
 #include "third_party/blink/public/mojom/mediastream/media_stream.mojom.h"
 
 using content_settings::PageSpecificContentSettings;
@@ -53,11 +54,12 @@ class MediaStreamDevicesControllerTest : public WebRtcTestBase {
             blink::mojom::MediaStreamRequestResult::NUM_MEDIA_REQUEST_RESULTS) {
   }
 
-  void OnMediaStreamResponse(const blink::mojom::StreamDevices& devices,
-                             blink::mojom::MediaStreamRequestResult result,
-                             std::unique_ptr<content::MediaStreamUI> ui) {
+  void OnMediaStreamResponse(
+      const blink::mojom::StreamDevicesSet& stream_devices_set,
+      blink::mojom::MediaStreamRequestResult result,
+      std::unique_ptr<content::MediaStreamUI> ui) {
     blink::MediaStreamDevices devices_list =
-        blink::StreamDevicesToMediaStreamDevicesList(devices);
+        blink::ToMediaStreamDevicesList(stream_devices_set);
     EXPECT_EQ(devices_list.empty(), !ui);
     media_stream_devices_ = devices_list;
     media_stream_result_ = result;
@@ -960,14 +962,16 @@ IN_PROC_BROWSER_TEST_F(MediaStreamDevicesControllerTest,
   permission_bubble_media_access_handler_->HandleRequest(
       prompt_contents,
       CreateRequest(example_audio_id(), example_video_id(), false),
-      base::BindOnce([](const blink::mojom::StreamDevices& devices,
-                        blink::mojom::MediaStreamRequestResult result,
-                        std::unique_ptr<content::MediaStreamUI> ui) {
-        // The permission may be dismissed before we have a chance to delete the
-        // request.
-        EXPECT_EQ(blink::mojom::MediaStreamRequestResult::PERMISSION_DISMISSED,
-                  result);
-      }),
+      base::BindOnce(
+          [](const blink::mojom::StreamDevicesSet& stream_devices_set,
+             blink::mojom::MediaStreamRequestResult result,
+             std::unique_ptr<content::MediaStreamUI> ui) {
+            // The permission may be dismissed before we have a chance to delete
+            // the request.
+            EXPECT_EQ(
+                blink::mojom::MediaStreamRequestResult::PERMISSION_DISMISSED,
+                result);
+          }),
       nullptr);
   // Since the mock prompt factory holds a reference to the
   // PermissionRequestManager for the WebContents and uses that reference in its

chrome/browser/media/webrtc/permission_bubble_media_access_handler.cc

@@ -54,7 +54,7 @@
 using content::BrowserThread;
 
 using MediaResponseCallback =
-    base::OnceCallback<void(const blink::mojom::StreamDevices& devices,
+    base::OnceCallback<void(const blink::mojom::StreamDevicesSet& devices,
                             blink::mojom::MediaStreamRequestResult result,
                             std::unique_ptr<content::MediaStreamUI> ui)>;
 
@@ -214,7 +214,7 @@ void PermissionBubbleMediaAccessHandler::HandleRequest(
     // If screen capturing isn't enabled on Android, we'll use "invalid state"
     // as result, same as on desktop.
     std::move(callback).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::INVALID_STATE, nullptr);
     return;
   }
@@ -310,7 +310,7 @@ void PermissionBubbleMediaAccessHandler::OnMediaStreamRequestResponse(
     content::WebContents* web_contents,
     int64_t request_id,
     content::MediaStreamRequest request,
-    const blink::mojom::StreamDevices& devices,
+    const blink::mojom::StreamDevicesSet& stream_devices_set,
     blink::mojom::MediaStreamRequestResult result,
     bool blocked_by_permissions_policy,
     ContentSetting audio_setting,
@@ -328,20 +328,40 @@ void PermissionBubbleMediaAccessHandler::OnMediaStreamRequestResponse(
                                       video_setting);
   }
 
+  // At most one stream is expected as this function is not used with the
+  // getDisplayMediaSet API (only used with getUserMedia).
+  DCHECK_LE(stream_devices_set.stream_devices.size(), 1u);
+  blink::mojom::StreamDevices devices;
+  if (!stream_devices_set.stream_devices.empty()) {
+    devices = *stream_devices_set.stream_devices[0];
+  }
+
   std::unique_ptr<content::MediaStreamUI> ui;
   if (devices.audio_device.has_value() || devices.video_device.has_value()) {
     ui = MediaCaptureDevicesDispatcher::GetInstance()
              ->GetMediaStreamCaptureIndicator()
              ->RegisterMediaStream(web_contents, devices);
   }
-  OnAccessRequestResponse(web_contents, request_id, devices, result,
+  OnAccessRequestResponse(web_contents, request_id, stream_devices_set, result,
+                          std::move(ui));
+}
+
+void PermissionBubbleMediaAccessHandler::OnAccessRequestResponseForBinding(
+    content::WebContents* web_contents,
+    int64_t request_id,
+    blink::mojom::StreamDevicesSetPtr stream_devices_set,
+    blink::mojom::MediaStreamRequestResult result,
+    std::unique_ptr<content::MediaStreamUI> ui) {
+  DCHECK(stream_devices_set);
+  DCHECK(ui);
+  OnAccessRequestResponse(web_contents, request_id, *stream_devices_set, result,
                           std::move(ui));
 }
 
 void PermissionBubbleMediaAccessHandler::OnAccessRequestResponse(
     content::WebContents* web_contents,
     int64_t request_id,
-    const blink::mojom::StreamDevices& devices,
+    const blink::mojom::StreamDevicesSet& stream_devices_set,
     blink::mojom::MediaStreamRequestResult result,
     std::unique_ptr<content::MediaStreamUI> ui) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
@@ -379,10 +399,10 @@ void PermissionBubbleMediaAccessHandler::OnAccessRequestResponse(
         // Using WeakPtr since callback can come at any time and we might be
         // destroyed.
         system_media_permissions::RequestSystemAudioCapturePermisson(
-            base::BindOnce(
-                &PermissionBubbleMediaAccessHandler::OnAccessRequestResponse,
-                weak_factory_.GetWeakPtr(), web_contents, request_id, devices,
-                result, std::move(ui)));
+            base::BindOnce(&PermissionBubbleMediaAccessHandler::
+                               OnAccessRequestResponseForBinding,
+                           weak_factory_.GetWeakPtr(), web_contents, request_id,
+                           stream_devices_set.Clone(), result, std::move(ui)));
         return;
       } else if (system_audio_permission == SystemPermission::kRestricted ||
                  system_audio_permission == SystemPermission::kDenied) {
@@ -406,10 +426,10 @@ void PermissionBubbleMediaAccessHandler::OnAccessRequestResponse(
         // Using WeakPtr since callback can come at any time and we might be
         // destroyed.
         system_media_permissions::RequestSystemVideoCapturePermisson(
-            base::BindOnce(
-                &PermissionBubbleMediaAccessHandler::OnAccessRequestResponse,
-                weak_factory_.GetWeakPtr(), web_contents, request_id, devices,
-                result, std::move(ui)));
+            base::BindOnce(&PermissionBubbleMediaAccessHandler::
+                               OnAccessRequestResponseForBinding,
+                           weak_factory_.GetWeakPtr(), web_contents, request_id,
+                           stream_devices_set.Clone(), result, std::move(ui)));
         return;
       } else if (system_video_permission == SystemPermission::kRestricted ||
                  system_video_permission == SystemPermission::kDenied) {
@@ -439,7 +459,7 @@ void PermissionBubbleMediaAccessHandler::OnAccessRequestResponse(
             base::Unretained(this), web_contents));
   }
 
-  std::move(callback).Run(devices, final_result, std::move(ui));
+  std::move(callback).Run(stream_devices_set, final_result, std::move(ui));
 }
 
 void PermissionBubbleMediaAccessHandler::WebContentsDestroyed(

chrome/browser/media/webrtc/permission_bubble_media_access_handler.h

@@ -60,16 +60,27 @@ class PermissionBubbleMediaAccessHandler
       content::WebContents* web_contents,
       int64_t request_id,
       content::MediaStreamRequest request,
-      const blink::mojom::StreamDevices& devices,
+      const blink::mojom::StreamDevicesSet& stream_devices_set,
       blink::mojom::MediaStreamRequestResult result,
       bool blocked_by_permissions_policy,
       ContentSetting audio_setting,
       ContentSetting video_setting);
-  void OnAccessRequestResponse(content::WebContents* web_contents,
-                               int64_t request_id,
-                               const blink::mojom::StreamDevices& devices,
-                               blink::mojom::MediaStreamRequestResult result,
-                               std::unique_ptr<content::MediaStreamUI> ui);
+  void OnAccessRequestResponse(
+      content::WebContents* web_contents,
+      int64_t request_id,
+      const blink::mojom::StreamDevicesSet& stream_devices_set,
+      blink::mojom::MediaStreamRequestResult result,
+      std::unique_ptr<content::MediaStreamUI> ui);
+  // OnAccessRequestResponse cannot be used together with base::BindOnce as
+  // StreamDevicesSet& cannot be captured (neither copyable nor movable).
+  // This method uses StreamDevicesSetPtr (movable) and forwards the data
+  // to OnAccessRequestResponse when calling the callback.
+  void OnAccessRequestResponseForBinding(
+      content::WebContents* web_contents,
+      int64_t request_id,
+      blink::mojom::StreamDevicesSetPtr stream_devices_set,
+      blink::mojom::MediaStreamRequestResult result,
+      std::unique_ptr<content::MediaStreamUI> ui);
 
   // WebContentsCollection::Observer:
   void WebContentsDestroyed(content::WebContents* web_contents) override;

chrome/browser/media/webrtc/screen_capture_permission_handler_android.cc

@@ -31,7 +31,12 @@ void GetScreenCapturePermissionAndroid(
           ? blink::mojom::MediaStreamRequestResult::OK
           : blink::mojom::MediaStreamRequestResult::INVALID_STATE;
 
-  blink::mojom::StreamDevices devices;
+  // TODO(crbug.com/1300883): Generalize to multiple streams.
+  blink::mojom::StreamDevicesSet stream_devices_set;
+  stream_devices_set.stream_devices.emplace_back(
+      blink::mojom::StreamDevices::New());
+  blink::mojom::StreamDevices& stream_devices =
+      *stream_devices_set.stream_devices[0];
   std::unique_ptr<content::MediaStreamUI> ui;
   if (result == blink::mojom::MediaStreamRequestResult::OK) {
     if (request.video_type ==
@@ -40,20 +45,20 @@ void GetScreenCapturePermissionAndroid(
       screen_id.type = content::DesktopMediaID::TYPE_WEB_CONTENTS;
       screen_id.web_contents_id = content::WebContentsMediaCaptureId(
           request.render_process_id, request.render_frame_id);
-      devices.video_device = blink::MediaStreamDevice(
+      stream_devices.video_device = blink::MediaStreamDevice(
           request.video_type, screen_id.ToString(), "Current Tab");
     } else {
       content::DesktopMediaID screen_id = content::DesktopMediaID(
           content::DesktopMediaID::TYPE_SCREEN, webrtc::kFullDesktopScreenId);
-      devices.video_device = blink::MediaStreamDevice(
+      stream_devices.video_device = blink::MediaStreamDevice(
           request.video_type, screen_id.ToString(), "Screen");
     }
 
     ui = MediaCaptureDevicesDispatcher::GetInstance()
              ->GetMediaStreamCaptureIndicator()
-             ->RegisterMediaStream(web_contents, devices);
+             ->RegisterMediaStream(web_contents, stream_devices);
   }
 
-  std::move(callback).Run(devices, result, std::move(ui));
+  std::move(callback).Run(stream_devices_set, result, std::move(ui));
 }
 }  // namespace screen_capture

chrome/browser/media/webrtc/tab_capture_access_handler.cc

@@ -128,7 +128,7 @@ void TabCaptureAccessHandler::HandleRequest(
   if (!tab_capture_registry) {
     NOTREACHED();
     std::move(callback).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::INVALID_STATE, /*ui=*/nullptr);
     return;
   }
@@ -146,7 +146,7 @@ void TabCaptureAccessHandler::HandleRequest(
                                            request.render_frame_id));
   if (!can_show_web_contents.Run(target_web_contents)) {
     std::move(callback).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::PERMISSION_DENIED,
         /*ui=*/nullptr);
     return;
@@ -159,7 +159,7 @@ void TabCaptureAccessHandler::HandleRequest(
   if (!tab_capture_registry->VerifyRequest(
           request.render_process_id, request.render_frame_id, extension_id)) {
     std::move(callback).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::INVALID_STATE, /*ui=*/nullptr);
     return;
   }
@@ -217,13 +217,20 @@ void TabCaptureAccessHandler::AcceptRequest(
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   DCHECK(web_contents);
 
-  blink::mojom::StreamDevices devices;
-  std::unique_ptr<content::MediaStreamUI> ui =
-      GetMediaStreamUI(request, web_contents, std::move(media_ui), devices);
-  DCHECK(devices.audio_device.has_value() || devices.video_device.has_value());
+  // TOOD(crbug.com/1300883): Generalize to multiple streams.
+  blink::mojom::StreamDevicesSet stream_devices_set;
+  stream_devices_set.stream_devices.emplace_back(
+      blink::mojom::StreamDevices::New());
+  blink::mojom::StreamDevices& stream_devices =
+      *stream_devices_set.stream_devices[0];
+  std::unique_ptr<content::MediaStreamUI> ui = GetMediaStreamUI(
+      request, web_contents, std::move(media_ui), stream_devices);
+  DCHECK(stream_devices.audio_device.has_value() ||
+         stream_devices.video_device.has_value());
 
   UpdateExtensionTrusted(request, is_allowlisted_extension);
-  std::move(callback).Run(devices, blink::mojom::MediaStreamRequestResult::OK,
+  std::move(callback).Run(stream_devices_set,
+                          blink::mojom::MediaStreamRequestResult::OK,
                           std::move(ui));
 }
 
@@ -246,7 +253,7 @@ void TabCaptureAccessHandler::OnDlpRestrictionChecked(
                   std::move(media_ui));
   } else {
     std::move(pending_request->callback)
-        .Run(blink::mojom::StreamDevices(),
+        .Run(blink::mojom::StreamDevicesSet(),
              blink::mojom::MediaStreamRequestResult::PERMISSION_DENIED,
              /*ui=*/nullptr);
   }

chrome/browser/media/webrtc/tab_capture_access_handler_unittest.cc

@@ -66,11 +66,19 @@ class TabCaptureAccessHandlerTest : public ChromeRenderViewHostTestHarness {
         [](base::RunLoop* wait_loop, bool expect_result,
            blink::mojom::MediaStreamRequestResult* request_result,
            blink::mojom::StreamDevices* devices_result,
-           const blink::mojom::StreamDevices& devices,
+           const blink::mojom::StreamDevicesSet& stream_devices_set,
            blink::mojom::MediaStreamRequestResult result,
            std::unique_ptr<content::MediaStreamUI> ui) {
+          DCHECK(!devices_result->audio_device);
+          DCHECK(!devices_result->video_device);
           *request_result = result;
-          *devices_result = devices;
+          if (result == blink::mojom::MediaStreamRequestResult::OK) {
+            ASSERT_EQ(stream_devices_set.stream_devices.size(), 1u);
+            *devices_result = *stream_devices_set.stream_devices[0];
+          } else {
+            ASSERT_TRUE(stream_devices_set.stream_devices.empty());
+            *devices_result = blink::mojom::StreamDevices();
+          }
           if (!expect_result) {
             FAIL() << "MediaResponseCallback should not be called.";
           }
@@ -212,4 +220,5 @@ TEST_F(TabCaptureAccessHandlerTest, DlpWebContentsDestroyed) {
   EXPECT_FALSE(devices.video_device.has_value());
   EXPECT_FALSE(devices.audio_device.has_value());
 }
+
 #endif  // BUILDFLAG(IS_CHROMEOS)

chrome/browser/policy/test/media_stream_policy_browsertest.cc

@@ -108,22 +108,29 @@ class MediaStreamDevicesControllerBrowserTest
     }
   }
 
-  void Accept(const blink::mojom::StreamDevices& devices,
+  void Accept(const blink::mojom::StreamDevicesSet& stream_devices_set,
               blink::mojom::MediaStreamRequestResult result,
               bool blocked_by_permissions_policy,
               ContentSetting audio_setting,
               ContentSetting video_setting) {
-    if (policy_value_ || request_url_allowed_via_allowlist_) {
-      ASSERT_EQ(1, devices.audio_device.has_value() +
-                       devices.video_device.has_value());
-      if (devices.audio_device.has_value()) {
-        ASSERT_EQ("fake_dev", devices.audio_device.value().id);
-      } else if (devices.video_device.has_value()) {
-        ASSERT_EQ("fake_dev", devices.video_device.value().id);
+    if (result == blink::mojom::MediaStreamRequestResult::OK) {
+      ASSERT_EQ(stream_devices_set.stream_devices.size(), 1u);
+      const blink::mojom::StreamDevices& devices =
+          *stream_devices_set.stream_devices[0];
+      if (policy_value_ || request_url_allowed_via_allowlist_) {
+        ASSERT_EQ(1, devices.audio_device.has_value() +
+                         devices.video_device.has_value());
+        if (devices.audio_device.has_value()) {
+          ASSERT_EQ("fake_dev", devices.audio_device.value().id);
+        } else if (devices.video_device.has_value()) {
+          ASSERT_EQ("fake_dev", devices.video_device.value().id);
+        }
+      } else {
+        ASSERT_FALSE(devices.audio_device.has_value());
+        ASSERT_FALSE(devices.video_device.has_value());
       }
     } else {
-      ASSERT_FALSE(devices.audio_device.has_value());
-      ASSERT_FALSE(devices.video_device.has_value());
+      ASSERT_EQ(0u, stream_devices_set.stream_devices.size());
     }
   }
 

chrome/browser/ui/ash/ash_web_view_impl.cc

@@ -136,7 +136,7 @@ void AshWebViewImpl::RequestMediaAccessPermission(
     content::MediaResponseCallback callback) {
   if (!params_.can_record_media) {
     std::move(callback).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::NOT_SUPPORTED,
         std::unique_ptr<content::MediaStreamUI>());
     return;

chromecast/browser/cast_web_view_default.cc

@@ -245,7 +245,7 @@ void CastWebViewDefault::RequestMediaAccessPermission(
       !params_->allow_media_access) {
     LOG(WARNING) << __func__ << ": media access is disabled.";
     std::move(callback).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::NOT_SUPPORTED,
         std::unique_ptr<content::MediaStreamUI>());
     return;
@@ -258,7 +258,10 @@ void CastWebViewDefault::RequestMediaAccessPermission(
   DVLOG(2) << __func__ << " audio_devices=" << audio_devices.size()
            << " video_devices=" << video_devices.size();
 
-  blink::mojom::StreamDevices devices;
+  blink::mojom::StreamDevicesSet stream_devices_set;
+  stream_devices_set.stream_devices.emplace_back(
+      blink::mojom::StreamDevices::New());
+  blink::mojom::StreamDevices& devices = *stream_devices_set.stream_devices[0];
   if (request.audio_type ==
       blink::mojom::MediaStreamType::DEVICE_AUDIO_CAPTURE) {
     const blink::MediaStreamDevice* device = GetRequestedDeviceOrDefault(
@@ -281,7 +284,8 @@ void CastWebViewDefault::RequestMediaAccessPermission(
     }
   }
 
-  std::move(callback).Run(devices, blink::mojom::MediaStreamRequestResult::OK,
+  std::move(callback).Run(stream_devices_set,
+                          blink::mojom::MediaStreamRequestResult::OK,
                           std::unique_ptr<content::MediaStreamUI>());
 }
 

components/offline_pages/content/background_loader/background_loader_contents.cc

@@ -116,7 +116,7 @@ void BackgroundLoaderContents::RequestMediaAccessPermission(
     content::MediaResponseCallback callback) {
   // No permissions granted, act as if dismissed.
   std::move(callback).Run(
-      blink::mojom::StreamDevices(),
+      blink::mojom::StreamDevicesSet(),
       blink::mojom::MediaStreamRequestResult::PERMISSION_DISMISSED,
       std::unique_ptr<content::MediaStreamUI>());
 }

components/offline_pages/content/background_loader/background_loader_contents_unittest.cc

@@ -37,9 +37,10 @@ class BackgroundLoaderContentsTest : public testing::Test,
   bool download() { return download_; }
   bool can_download_delegate_called() { return delegate_called_; }
 
-  void MediaAccessCallback(const blink::mojom::StreamDevices& devices,
-                           blink::mojom::MediaStreamRequestResult result,
-                           std::unique_ptr<content::MediaStreamUI> ui);
+  void MediaAccessCallback(
+      const blink::mojom::StreamDevicesSet& stream_devices_set,
+      blink::mojom::MediaStreamRequestResult result,
+      std::unique_ptr<content::MediaStreamUI> ui);
   blink::mojom::StreamDevices& devices() { return devices_; }
   blink::mojom::MediaStreamRequestResult request_result() {
     return request_result_;
@@ -91,10 +92,15 @@ void BackgroundLoaderContentsTest::SetDelegate() {
 }
 
 void BackgroundLoaderContentsTest::MediaAccessCallback(
-    const blink::mojom::StreamDevices& devices,
+    const blink::mojom::StreamDevicesSet& stream_devices_set,
     blink::mojom::MediaStreamRequestResult result,
     std::unique_ptr<content::MediaStreamUI> ui) {
-  devices_ = devices;
+  if (result == blink::mojom::MediaStreamRequestResult::OK) {
+    ASSERT_FALSE(stream_devices_set.stream_devices.empty());
+    devices_ = *stream_devices_set.stream_devices[0];
+  } else {
+    ASSERT_TRUE(stream_devices_set.stream_devices.empty());
+  }
   request_result_ = result;
   media_stream_ui_.reset(ui.get());
   waiter_.Signal();

components/webrtc/media_stream_devices_controller.cc

@@ -63,7 +63,7 @@ void MediaStreamDevicesController::RequestPermissions(
   // The RFH may have been destroyed by the time the request is processed.
   if (!rfh) {
     std::move(callback).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::FAILED_DUE_TO_SHUTDOWN, false,
         {}, {});
     return;
@@ -71,7 +71,7 @@ void MediaStreamDevicesController::RequestPermissions(
 
   if (rfh->GetLastCommittedOrigin().GetURL().is_empty()) {
     std::move(callback).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::PERMISSION_DENIED, false, {},
         {});
     return;
@@ -79,7 +79,7 @@ void MediaStreamDevicesController::RequestPermissions(
 
   if (rfh->GetLastCommittedOrigin().GetURL() != request.security_origin) {
     std::move(callback).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::INVALID_SECURITY_ORIGIN, false,
         {}, {});
     return;
@@ -166,7 +166,7 @@ void MediaStreamDevicesController::RequestPermissions(
 MediaStreamDevicesController::~MediaStreamDevicesController() {
   if (!callback_.is_null()) {
     std::move(callback_).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::FAILED_DUE_TO_SHUTDOWN, false,
         {}, {});
   }
@@ -202,16 +202,21 @@ bool MediaStreamDevicesController::ShouldRequestVideo() const {
   return video_setting_ == CONTENT_SETTING_ASK;
 }
 
-blink::mojom::StreamDevices MediaStreamDevicesController::GetDevices(
+blink::mojom::StreamDevicesSetPtr MediaStreamDevicesController::GetDevices(
     ContentSetting audio_setting,
     ContentSetting video_setting) {
   bool audio_allowed = audio_setting == CONTENT_SETTING_ALLOW;
   bool video_allowed = video_setting == CONTENT_SETTING_ALLOW;
 
+  blink::mojom::StreamDevicesSetPtr stream_devices_set =
+      blink::mojom::StreamDevicesSet::New();
   if (!audio_allowed && !video_allowed)
-    return blink::mojom::StreamDevices();
+    return nullptr;
 
-  blink::mojom::StreamDevices devices;
+  // TODO(crbug.com/1300883): Generalize to multiple streams.
+  stream_devices_set->stream_devices.emplace_back(
+      blink::mojom::StreamDevices::New());
+  blink::mojom::StreamDevices& devices = *stream_devices_set->stream_devices[0];
   switch (request_.request_type) {
     case blink::MEDIA_OPEN_DEVICE_PEPPER_ONLY: {
       // For open device request, when requested device_id is empty, pick
@@ -303,14 +308,14 @@ blink::mojom::StreamDevices MediaStreamDevicesController::GetDevices(
     }
   }  // switch
 
-  return devices;
+  return stream_devices_set;
 }
 
 void MediaStreamDevicesController::RunCallback(
     bool blocked_by_permissions_policy) {
   CHECK(callback_);
 
-  blink::mojom::StreamDevices devices;
+  blink::mojom::StreamDevicesSetPtr stream_devices_set;
   // If all requested permissions are allowed then the callback should report
   // success, otherwise we report |denial_reason_|.
   blink::mojom::MediaStreamRequestResult request_result =
@@ -319,7 +324,14 @@ void MediaStreamDevicesController::RunCallback(
        audio_setting_ == CONTENT_SETTING_DEFAULT) &&
       (video_setting_ == CONTENT_SETTING_ALLOW ||
        video_setting_ == CONTENT_SETTING_DEFAULT)) {
-    devices = GetDevices(audio_setting_, video_setting_);
+    stream_devices_set = GetDevices(audio_setting_, video_setting_);
+    DCHECK(!stream_devices_set ||
+           stream_devices_set->stream_devices.size() <= 1u);
+    blink::mojom::StreamDevices devices;
+    if (stream_devices_set && !stream_devices_set->stream_devices.empty()) {
+      devices = *stream_devices_set->stream_devices[0];
+    }
+
     if (!devices.audio_device.has_value() &&
         !devices.video_device.has_value()) {
       // Even if all requested permissions are allowed, if there are no devices
@@ -329,9 +341,10 @@ void MediaStreamDevicesController::RunCallback(
   } else {
     DCHECK_NE(blink::mojom::MediaStreamRequestResult::OK, denial_reason_);
     request_result = denial_reason_;
+    stream_devices_set = blink::mojom::StreamDevicesSet::New();
   }
 
-  std::move(callback_).Run(devices, request_result,
+  std::move(callback_).Run(*stream_devices_set, request_result,
                            blocked_by_permissions_policy, audio_setting_,
                            video_setting_);
 }

components/webrtc/media_stream_devices_controller.h

@@ -34,11 +34,12 @@ class MediaStreamDeviceEnumerator;
 // renderer.
 class MediaStreamDevicesController {
  public:
-  typedef base::OnceCallback<void(const blink::mojom::StreamDevices& devices,
-                                  blink::mojom::MediaStreamRequestResult result,
-                                  bool blocked_by_permissions_policy,
-                                  ContentSetting audio_setting,
-                                  ContentSetting video_setting)>
+  typedef base::OnceCallback<void(
+      const blink::mojom::StreamDevicesSet& stream_devices_set,
+      blink::mojom::MediaStreamRequestResult result,
+      bool blocked_by_permissions_policy,
+      ContentSetting audio_setting,
+      ContentSetting video_setting)>
       ResultCallback;
 
   // Requests the mic/camera permissions described in |request|, using
@@ -74,8 +75,8 @@ class MediaStreamDevicesController {
 
   // Returns a list of devices available for the request for the given
   // audio/video permission settings.
-  blink::mojom::StreamDevices GetDevices(ContentSetting audio_setting,
-                                         ContentSetting video_setting);
+  blink::mojom::StreamDevicesSetPtr GetDevices(ContentSetting audio_setting,
+                                               ContentSetting video_setting);
 
   // Runs |callback_| with the current audio/video permission settings.
   void RunCallback(bool blocked_by_permissions_policy);

content/browser/media/capture_handle_manager.cc

@@ -253,10 +253,12 @@ void CaptureHandleManager::OnTabCaptureStopped(
 
 void CaptureHandleManager::OnTabCaptureDevicesUpdated(
     const std::string& label,
-    const blink::mojom::StreamDevices& new_devices,
+    blink::mojom::StreamDevicesSetPtr new_stream_devices_set,
     GlobalRenderFrameHostId capturer,
     DeviceCaptureHandleChangeCallback handle_change_callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  DCHECK(new_stream_devices_set);
+  DCHECK_EQ(1u, new_stream_devices_set->stream_devices.size());
 
   // Pause tracking of all old devices.
   for (auto& capture : captures_) {
@@ -266,6 +268,8 @@ void CaptureHandleManager::OnTabCaptureDevicesUpdated(
   }
 
   // Start tracking any new devices; resume tracking of changed devices.
+  const blink::mojom::StreamDevices& new_devices =
+      *new_stream_devices_set->stream_devices[0];
   if (new_devices.audio_device.has_value()) {
     OnTabCaptureStarted(label, new_devices.audio_device.value(), capturer,
                         handle_change_callback);

content/browser/media/capture_handle_manager.h

@@ -50,7 +50,7 @@ class CONTENT_EXPORT CaptureHandleManager {
   // then calling OnTabCaptureStarted() on all |new_devices|.
   void OnTabCaptureDevicesUpdated(
       const std::string& label,
-      const blink::mojom::StreamDevices& new_devices,
+      blink::mojom::StreamDevicesSetPtr new_stream_devices,
       GlobalRenderFrameHostId capturer,
       DeviceCaptureHandleChangeCallback handle_change_callback);
 

content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc

@@ -70,11 +70,42 @@ constexpr int kProcessId = 5;
 constexpr int kRenderId = 6;
 constexpr int kRequesterId = 7;
 constexpr int kPageRequestId = 8;
-constexpr const char* kRegularVideoDeviceId = "stub_device_0";
+constexpr const char* kRegularVideoDeviceId1 = "stub_device_1";
+constexpr const char* kRegularVideoDeviceId2 = "stub_device_2";
 constexpr const char* kDepthVideoDeviceId = "stub_device_1 (depth)";
 constexpr media::VideoCaptureApi kStubCaptureApi =
     media::VideoCaptureApi::LINUX_V4L2_SINGLE_PLANE;
 
+bool DoStreamDevicesHaveSameTypes(const blink::mojom::StreamDevices& lhs,
+                                  const blink::mojom::StreamDevices& rhs) {
+  return lhs.audio_device.has_value() == rhs.audio_device.has_value() &&
+         lhs.video_device.has_value() == rhs.video_device.has_value();
+}
+
+MATCHER_P(SameTypesAs,
+          expected_stream_devices_set_ref,
+          "Compares if two StreamDevices objects contain the same number and "
+          "type of MediaStreamDevice objects.") {
+  const blink::mojom::StreamDevicesSet& stream_devices_set = arg;
+  const blink::mojom::StreamDevicesSet& expected_stream_devices_set =
+      expected_stream_devices_set_ref.get();
+
+  if (stream_devices_set.stream_devices.size() !=
+      expected_stream_devices_set.stream_devices.size()) {
+    return false;
+  }
+
+  for (size_t i = 0; i < stream_devices_set.stream_devices.size(); ++i) {
+    if (!DoStreamDevicesHaveSameTypes(
+            *stream_devices_set.stream_devices[i],
+            *expected_stream_devices_set.stream_devices[i])) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
 void AudioInputDevicesEnumerated(base::OnceClosure quit_closure,
                                  media::AudioDeviceDescriptions* out,
                                  const MediaDeviceEnumeration& enumeration) {
@@ -99,10 +130,9 @@ class MockMediaStreamDispatcherHost
   ~MockMediaStreamDispatcherHost() override {}
 
   // A list of mock methods.
-  MOCK_METHOD3(OnStreamGenerationSuccess,
+  MOCK_METHOD2(OnStreamGenerationSuccess,
                void(int request_id,
-                    int audio_array_size,
-                    int video_array_size));
+                    const blink::mojom::StreamDevicesSet& stream_devices_set));
   MOCK_METHOD2(OnStreamGenerationFailure,
                void(int request_id,
                     blink::mojom::MediaStreamRequestResult result));
@@ -193,21 +223,7 @@ class MockMediaStreamDispatcherHost
       return;
     }
 
-    DCHECK(stream_devices_set);
-
-    size_t audio_devices_count = base::ranges::count_if(
-        stream_devices_set->stream_devices,
-        [](const blink::mojom::StreamDevicesPtr& devices) {
-          return devices->audio_device.has_value();
-        });
-    size_t video_devices_count = base::ranges::count_if(
-        stream_devices_set->stream_devices,
-        [](const blink::mojom::StreamDevicesPtr& devices) {
-          return devices->video_device.has_value();
-        });
-
-    OnStreamGenerationSuccess(request_id, audio_devices_count,
-                              video_devices_count);
+    OnStreamGenerationSuccess(request_id, *stream_devices_set);
     // Simulate the stream started event back to host for UI testing.
     OnStreamStarted(label);
 
@@ -327,7 +343,7 @@ class MediaStreamDispatcherHostTest : public testing::Test {
   }
 
   void SetUp() override {
-    stub_video_device_ids_.emplace_back(kRegularVideoDeviceId);
+    stub_video_device_ids_.emplace_back(kRegularVideoDeviceId1);
     stub_video_device_ids_.emplace_back(kDepthVideoDeviceId);
     ON_CALL(*mock_video_capture_provider_, GetDeviceInfosAsync(_))
         .WillByDefault(Invoke(
@@ -380,31 +396,34 @@ class MediaStreamDispatcherHostTest : public testing::Test {
     return fake_ui;
   }
 
-  virtual void SetupFakeUI(bool expect_started) {
+  virtual void SetupFakeUI(
+      bool expect_started,
+      const std::vector<std::pair<std::string, std::string>>&
+          devices_ids_to_select = {}) {
     media_stream_manager_->UseFakeUIFactoryForTests(
         base::BindRepeating(&MediaStreamDispatcherHostTest::CreateMockUI,
                             base::Unretained(this), expect_started));
   }
 
-  void GenerateStreamAndWaitForResult(int page_request_id,
-                                      const blink::StreamControls& controls) {
+  void GenerateStreamAndWaitForResult(
+      int page_request_id,
+      const blink::StreamControls& controls,
+      const blink::mojom::StreamDevicesSet& expectation) {
     base::RunLoop run_loop;
-    int expected_audio_array_size =
-        (controls.audio.requested && !audio_device_descriptions_.empty()) ? 1
-                                                                          : 0;
-    int expected_video_array_size =
-        (controls.video.requested && !stub_video_device_ids_.empty()) ? 1 : 0;
-    EXPECT_CALL(*host_, OnStreamGenerationSuccess(page_request_id,
-                                                  expected_audio_array_size,
-                                                  expected_video_array_size));
+    EXPECT_CALL(*host_,
+                OnStreamGenerationSuccess(page_request_id,
+                                          SameTypesAs(std::ref(expectation))));
     host_->OnGenerateStreams(page_request_id, controls, run_loop.QuitClosure());
     run_loop.Run();
-    EXPECT_FALSE(DoesContainRawIds(audio_device(/*stream_index=*/0u)));
-    EXPECT_FALSE(DoesContainRawIds(video_device(/*stream_index=*/0u)));
-    EXPECT_TRUE(
-        DoesEveryDeviceMapToRawId(audio_device(/*stream_index=*/0u), origin_));
-    EXPECT_TRUE(
-        DoesEveryDeviceMapToRawId(video_device(/*stream_index=*/0u), origin_));
+    for (const blink::mojom::StreamDevicesPtr& stream_devices :
+         host_->stream_devices_set_->stream_devices) {
+      EXPECT_FALSE(DoesContainRawIds(stream_devices->audio_device));
+      EXPECT_FALSE(DoesContainRawIds(stream_devices->video_device));
+      EXPECT_TRUE(
+          DoesEveryDeviceMapToRawId(stream_devices->audio_device, origin_));
+      EXPECT_TRUE(
+          DoesEveryDeviceMapToRawId(stream_devices->video_device, origin_));
+    }
   }
 
   void GenerateStreamAndWaitForFailure(
@@ -526,10 +545,14 @@ class MediaStreamDispatcherHostTest : public testing::Test {
 };
 
 TEST_F(MediaStreamDispatcherHostTest, GenerateStreamWithVideoOnly) {
+  stub_video_device_ids_.emplace_back(kRegularVideoDeviceId2);
   blink::StreamControls controls(false, true);
 
+  blink::mojom::StreamDevicesSet expectation;
+  expectation.stream_devices.emplace_back(blink::mojom::StreamDevices::New(
+      absl::nullopt, blink::MediaStreamDevice()));
   SetupFakeUI(true);
-  GenerateStreamAndWaitForResult(kPageRequestId, controls);
+  GenerateStreamAndWaitForResult(kPageRequestId, controls, expectation);
 
   EXPECT_FALSE(audio_device(/*stream_index=*/0u).has_value());
   EXPECT_TRUE(video_device(/*stream_index=*/0u).has_value());
@@ -539,7 +562,11 @@ TEST_F(MediaStreamDispatcherHostTest, GenerateStreamWithAudioOnly) {
   blink::StreamControls controls(true, false);
 
   SetupFakeUI(true);
-  GenerateStreamAndWaitForResult(kPageRequestId, controls);
+
+  blink::mojom::StreamDevicesSet expectation;
+  expectation.stream_devices.emplace_back(blink::mojom::StreamDevices::New(
+      blink::MediaStreamDevice(), absl::nullopt));
+  GenerateStreamAndWaitForResult(kPageRequestId, controls, expectation);
 
   EXPECT_TRUE(audio_device(/*stream_index=*/0u).has_value());
   EXPECT_FALSE(video_device(/*stream_index=*/0u).has_value());
@@ -612,8 +639,11 @@ TEST_F(MediaStreamDispatcherHostTest, GenerateStreamWithNothing) {
 TEST_F(MediaStreamDispatcherHostTest, GenerateStreamWithAudioAndVideo) {
   blink::StreamControls controls(true, true);
 
+  blink::mojom::StreamDevicesSet expectation;
+  expectation.stream_devices.emplace_back(blink::mojom::StreamDevices::New(
+      blink::MediaStreamDevice(), blink::MediaStreamDevice()));
   SetupFakeUI(true);
-  GenerateStreamAndWaitForResult(kPageRequestId, controls);
+  GenerateStreamAndWaitForResult(kPageRequestId, controls, expectation);
 
   EXPECT_TRUE(audio_device(/*stream_index=*/0u).has_value());
   EXPECT_TRUE(video_device(/*stream_index=*/0u).has_value());
@@ -630,8 +660,11 @@ TEST_F(MediaStreamDispatcherHostTest, GenerateStreamWithDepthVideo) {
   // See also MediaStreamManager::GenerateStream and other tests here.
   controls.video.device_id = source_id;
 
+  blink::mojom::StreamDevicesSet expectation;
+  expectation.stream_devices.emplace_back(blink::mojom::StreamDevices::New(
+      blink::MediaStreamDevice(), blink::MediaStreamDevice()));
   SetupFakeUI(true);
-  GenerateStreamAndWaitForResult(kPageRequestId, controls);
+  GenerateStreamAndWaitForResult(kPageRequestId, controls, expectation);
 
   // We specified the generation and expect to get
   // one audio and one depth video stream.
@@ -646,8 +679,11 @@ TEST_F(MediaStreamDispatcherHostTest, GenerateStreamsFromSameRenderId) {
   blink::StreamControls controls(false, true);
 
   // Generate first stream.
+  blink::mojom::StreamDevicesSet expectation;
+  expectation.stream_devices.emplace_back(blink::mojom::StreamDevices::New(
+      absl::nullopt, blink::MediaStreamDevice()));
   SetupFakeUI(true);
-  GenerateStreamAndWaitForResult(kPageRequestId, controls);
+  GenerateStreamAndWaitForResult(kPageRequestId, controls, expectation);
 
   // Check the latest generated stream.
   EXPECT_FALSE(audio_device(/*stream_index=*/0u).has_value());
@@ -660,7 +696,7 @@ TEST_F(MediaStreamDispatcherHostTest, GenerateStreamsFromSameRenderId) {
           .session_id();
 
   // Generate second stream.
-  GenerateStreamAndWaitForResult(kPageRequestId + 1, controls);
+  GenerateStreamAndWaitForResult(kPageRequestId + 1, controls, expectation);
 
   // Check the latest generated stream.
   EXPECT_FALSE(audio_device(/*stream_index=*/0u).has_value());
@@ -682,7 +718,10 @@ TEST_F(MediaStreamDispatcherHostTest,
   blink::StreamControls controls(false, true);
 
   // Generate first stream.
-  GenerateStreamAndWaitForResult(kPageRequestId, controls);
+  blink::mojom::StreamDevicesSet expectation;
+  expectation.stream_devices.emplace_back(blink::mojom::StreamDevices::New(
+      absl::nullopt, blink::MediaStreamDevice()));
+  GenerateStreamAndWaitForResult(kPageRequestId, controls, expectation);
 
   EXPECT_FALSE(audio_device(/*stream_index=*/0u).has_value());
   EXPECT_TRUE(video_device(/*stream_index=*/0u).has_value());
@@ -711,8 +750,11 @@ TEST_F(MediaStreamDispatcherHostTest, GenerateStreamsDifferentRenderId) {
   blink::StreamControls controls(false, true);
 
   // Generate first stream.
+  blink::mojom::StreamDevicesSet expectation;
+  expectation.stream_devices.emplace_back(blink::mojom::StreamDevices::New(
+      absl::nullopt, blink::MediaStreamDevice()));
   SetupFakeUI(true);
-  GenerateStreamAndWaitForResult(kPageRequestId, controls);
+  GenerateStreamAndWaitForResult(kPageRequestId, controls, expectation);
 
   // Check the latest generated stream.
   EXPECT_FALSE(audio_device(/*stream_index=*/0u).has_value());
@@ -720,9 +762,7 @@ TEST_F(MediaStreamDispatcherHostTest, GenerateStreamsDifferentRenderId) {
   const std::string label1 = host_->label_;
   const std::string device_id1 = video_device(/*stream_index=*/0u).value().id;
   const base::UnguessableToken session_id1 =
-      host_->stream_devices_set_->stream_devices[0]
-          ->video_device.value()
-          .session_id();
+      video_device(/*stream_index=*/0u).value().session_id();
 
   // Generate second stream from another render frame.
   host_ = std::make_unique<MockMediaStreamDispatcherHost>(
@@ -733,7 +773,7 @@ TEST_F(MediaStreamDispatcherHostTest, GenerateStreamsDifferentRenderId) {
   host_->SetMediaStreamDeviceObserverForTesting(
       host_->BindNewPipeAndPassRemote());
 
-  GenerateStreamAndWaitForResult(kPageRequestId + 1, controls);
+  GenerateStreamAndWaitForResult(kPageRequestId + 1, controls, expectation);
 
   // Check the latest generated stream.
   EXPECT_FALSE(audio_device(/*stream_index=*/0u).has_value());
@@ -781,13 +821,21 @@ TEST_F(MediaStreamDispatcherHostTest, WebContentsNotFocusedInBackgroundPage) {
   base::RunLoop run_loop;
   host_->OnGenerateStreams(kPageRequestId, controls, run_loop.QuitClosure());
 
-  int expected_audio_array_size =
-      (controls.audio.requested && !audio_device_descriptions_.empty()) ? 1 : 0;
-  int expected_video_array_size =
-      (controls.video.requested && !stub_video_device_ids_.empty()) ? 1 : 0;
-  EXPECT_CALL(*host_, OnStreamGenerationSuccess(kPageRequestId,
-                                                expected_audio_array_size,
-                                                expected_video_array_size))
+  absl::optional<blink::MediaStreamDevice> expected_audio_device;
+  if (controls.audio.requested && !audio_device_descriptions_.empty()) {
+    expected_audio_device = blink::MediaStreamDevice();
+  }
+
+  absl::optional<blink::MediaStreamDevice> expected_video_device;
+  if (controls.video.requested && !stub_video_device_ids_.empty()) {
+    expected_video_device = blink::MediaStreamDevice();
+  }
+
+  blink::mojom::StreamDevicesSet expectation;
+  expectation.stream_devices.emplace_back(blink::mojom::StreamDevices::New(
+      expected_audio_device, expected_video_device));
+  EXPECT_CALL(*host_, OnStreamGenerationSuccess(
+                          kPageRequestId, SameTypesAs(std::ref(expectation))))
       .Times(1);
 
   run_loop.Run();
@@ -809,13 +857,21 @@ TEST_F(MediaStreamDispatcherHostTest, WebContentsFocused) {
   host_->OnGenerateStreams(kPageRequestId, controls, run_loop.QuitClosure());
   run_loop.RunUntilIdle();
 
-  int expected_audio_array_size =
-      (controls.audio.requested && !audio_device_descriptions_.empty()) ? 1 : 0;
-  int expected_video_array_size =
-      (controls.video.requested && !stub_video_device_ids_.empty()) ? 1 : 0;
-  EXPECT_CALL(*host_, OnStreamGenerationSuccess(kPageRequestId,
-                                                expected_audio_array_size,
-                                                expected_video_array_size))
+  absl::optional<blink::MediaStreamDevice> expected_audio_device;
+  if (controls.audio.requested && !audio_device_descriptions_.empty()) {
+    expected_audio_device = blink::MediaStreamDevice();
+  }
+
+  absl::optional<blink::MediaStreamDevice> expected_video_device;
+  if (controls.video.requested && !stub_video_device_ids_.empty()) {
+    expected_video_device = blink::MediaStreamDevice();
+  }
+
+  blink::mojom::StreamDevicesSet expectation;
+  expectation.stream_devices.emplace_back(blink::mojom::StreamDevices::New(
+      expected_audio_device, expected_video_device));
+  EXPECT_CALL(*host_, OnStreamGenerationSuccess(
+                          kPageRequestId, SameTypesAs(std::ref(expectation))))
       .Times(1);
 
   focus_ = true;
@@ -836,13 +892,20 @@ TEST_F(MediaStreamDispatcherHostTest, GenerateStreamsWithoutWaiting) {
   blink::StreamControls controls(false, true);
 
   // Generate first stream.
+  blink::mojom::StreamDevicesSet expectation;
+  expectation.stream_devices.emplace_back(blink::mojom::StreamDevices::New(
+      absl::nullopt, blink::MediaStreamDevice()));
   SetupFakeUI(true);
   {
     InSequence s;
-    EXPECT_CALL(*host_, OnStreamGenerationSuccess(kPageRequestId, 0, 1));
+    EXPECT_CALL(*host_,
+                OnStreamGenerationSuccess(kPageRequestId,
+                                          SameTypesAs(std::ref(expectation))));
 
     // Generate second stream.
-    EXPECT_CALL(*host_, OnStreamGenerationSuccess(kPageRequestId + 1, 0, 1));
+    EXPECT_CALL(*host_,
+                OnStreamGenerationSuccess(kPageRequestId + 1,
+                                          SameTypesAs(std::ref(expectation))));
   }
   base::RunLoop run_loop1;
   base::RunLoop run_loop2;
@@ -860,6 +923,10 @@ TEST_F(MediaStreamDispatcherHostTest, GenerateStreamsWithSourceId) {
   ASSERT_GE(audio_device_descriptions_.size(), 1u);
   ASSERT_GE(stub_video_device_ids_.size(), 1u);
 
+  blink::mojom::StreamDevicesSet expectation;
+  expectation.stream_devices.emplace_back(blink::mojom::StreamDevices::New(
+      blink::MediaStreamDevice(), blink::MediaStreamDevice()));
+
   media::AudioDeviceDescriptions::const_iterator audio_it =
       audio_device_descriptions_.begin();
   for (; audio_it != audio_device_descriptions_.end(); ++audio_it) {
@@ -870,7 +937,7 @@ TEST_F(MediaStreamDispatcherHostTest, GenerateStreamsWithSourceId) {
     controls.audio.device_id = source_id;
 
     SetupFakeUI(true);
-    GenerateStreamAndWaitForResult(kPageRequestId, controls);
+    GenerateStreamAndWaitForResult(kPageRequestId, controls, expectation);
     EXPECT_EQ(audio_device(/*stream_index=*/0u).value().id, source_id);
   }
 
@@ -881,7 +948,7 @@ TEST_F(MediaStreamDispatcherHostTest, GenerateStreamsWithSourceId) {
     blink::StreamControls controls(true, true);
     controls.video.device_id = source_id;
 
-    GenerateStreamAndWaitForResult(kPageRequestId, controls);
+    GenerateStreamAndWaitForResult(kPageRequestId, controls, expectation);
     EXPECT_EQ(video_device(/*stream_index=*/0u).value().id, source_id);
   }
 }
@@ -922,8 +989,12 @@ TEST_F(MediaStreamDispatcherHostTest, GenerateStreamsNoAvailableVideoDevice) {
 TEST_F(MediaStreamDispatcherHostTest, StopDeviceInStream) {
   blink::StreamControls controls(false, true);
 
+  blink::mojom::StreamDevicesSet expectation;
+  expectation.stream_devices.emplace_back(blink::mojom::StreamDevices::New(
+      absl::nullopt, blink::MediaStreamDevice()));
+
   SetupFakeUI(true);
-  GenerateStreamAndWaitForResult(kPageRequestId, controls);
+  GenerateStreamAndWaitForResult(kPageRequestId, controls, expectation);
 
   std::string stream_request_label = host_->label_;
   blink::MediaStreamDevice current_video_device =
@@ -951,8 +1022,11 @@ TEST_F(MediaStreamDispatcherHostTest, StopDeviceInStream) {
 TEST_F(MediaStreamDispatcherHostTest, StopDeviceInStreamAndRestart) {
   blink::StreamControls controls(true, true);
 
+  blink::mojom::StreamDevicesSet expectation;
+  expectation.stream_devices.emplace_back(blink::mojom::StreamDevices::New(
+      blink::MediaStreamDevice(), blink::MediaStreamDevice()));
   SetupFakeUI(true);
-  GenerateStreamAndWaitForResult(kPageRequestId, controls);
+  GenerateStreamAndWaitForResult(kPageRequestId, controls, expectation);
 
   std::string request_label1 = host_->label_;
   blink::MediaStreamDevice current_video_device =
@@ -968,7 +1042,7 @@ TEST_F(MediaStreamDispatcherHostTest, StopDeviceInStreamAndRestart) {
       1u,
       media_stream_manager_->GetDevicesOpenedByRequest(request_label1).size());
 
-  GenerateStreamAndWaitForResult(kPageRequestId, controls);
+  GenerateStreamAndWaitForResult(kPageRequestId, controls, expectation);
   std::string request_label2 = host_->label_;
 
   blink::MediaStreamDevices request1_devices =
@@ -988,12 +1062,18 @@ TEST_F(MediaStreamDispatcherHostTest,
        GenerateTwoStreamsAndStopDeviceWhileWaitingForSecondStream) {
   blink::StreamControls controls(false, true);
 
+  blink::mojom::StreamDevicesSet expectation;
+  expectation.stream_devices.emplace_back(blink::mojom::StreamDevices::New(
+      absl::nullopt, blink::MediaStreamDevice()));
+
   SetupFakeUI(true);
-  GenerateStreamAndWaitForResult(kPageRequestId, controls);
+  GenerateStreamAndWaitForResult(kPageRequestId, controls, expectation);
   EXPECT_TRUE(video_device(/*stream_index=*/0u).has_value());
 
   // Generate a second stream.
-  EXPECT_CALL(*host_, OnStreamGenerationSuccess(kPageRequestId + 1, 0, 1));
+  EXPECT_CALL(*host_,
+              OnStreamGenerationSuccess(kPageRequestId + 1,
+                                        SameTypesAs(std::ref(expectation))));
 
   base::RunLoop run_loop1;
   host_->OnGenerateStreams(kPageRequestId + 1, controls,
@@ -1029,12 +1109,16 @@ TEST_F(MediaStreamDispatcherHostTest, CancelPendingStreams) {
 TEST_F(MediaStreamDispatcherHostTest, StopGeneratedStreams) {
   blink::StreamControls controls(false, true);
 
+  blink::mojom::StreamDevicesSet expectation;
+  expectation.stream_devices.emplace_back(blink::mojom::StreamDevices::New(
+      absl::nullopt, blink::MediaStreamDevice()));
+
   SetupFakeUI(true);
 
   // Create first group of streams.
   size_t generated_streams = 3;
   for (size_t i = 0; i < generated_streams; ++i)
-    GenerateStreamAndWaitForResult(kPageRequestId + i, controls);
+    GenerateStreamAndWaitForResult(kPageRequestId + i, controls, expectation);
 
   media_stream_manager_->CancelAllRequests(kProcessId, kRenderId, kRequesterId);
   base::RunLoop().RunUntilIdle();
@@ -1043,6 +1127,10 @@ TEST_F(MediaStreamDispatcherHostTest, StopGeneratedStreams) {
 TEST_F(MediaStreamDispatcherHostTest, CloseFromUI) {
   blink::StreamControls controls(false, true);
 
+  blink::mojom::StreamDevicesSet expectation;
+  expectation.stream_devices.emplace_back(blink::mojom::StreamDevices::New(
+      absl::nullopt, blink::MediaStreamDevice()));
+
   base::OnceClosure close_callback;
   media_stream_manager_->UseFakeUIFactoryForTests(base::BindRepeating(
       [](base::OnceClosure* close_callback) {
@@ -1055,7 +1143,7 @@ TEST_F(MediaStreamDispatcherHostTest, CloseFromUI) {
       },
       &close_callback));
 
-  GenerateStreamAndWaitForResult(kPageRequestId, controls);
+  GenerateStreamAndWaitForResult(kPageRequestId, controls, expectation);
 
   EXPECT_FALSE(audio_device(/*stream_index=*/0u).has_value());
   EXPECT_TRUE(video_device(/*stream_index=*/0u).has_value());
@@ -1070,8 +1158,13 @@ TEST_F(MediaStreamDispatcherHostTest, CloseFromUI) {
 // being unplugged.
 TEST_F(MediaStreamDispatcherHostTest, VideoDeviceUnplugged) {
   blink::StreamControls controls(true, true);
+
+  blink::mojom::StreamDevicesSet expectation;
+  expectation.stream_devices.emplace_back(blink::mojom::StreamDevices::New(
+      blink::MediaStreamDevice(), blink::MediaStreamDevice()));
+
   SetupFakeUI(true);
-  GenerateStreamAndWaitForResult(kPageRequestId, controls);
+  GenerateStreamAndWaitForResult(kPageRequestId, controls, expectation);
   EXPECT_TRUE(audio_device(/*stream_index=*/0u).has_value());
   EXPECT_TRUE(video_device(/*stream_index=*/0u).has_value());
 
@@ -1092,8 +1185,12 @@ TEST_F(MediaStreamDispatcherHostTest, Salt) {
   SetupFakeUI(true);
   blink::StreamControls controls(false, true);
 
+  blink::mojom::StreamDevicesSet expectation;
+  expectation.stream_devices.emplace_back(blink::mojom::StreamDevices::New(
+      absl::nullopt, blink::MediaStreamDevice()));
+
   // Generate first stream.
-  GenerateStreamAndWaitForResult(kPageRequestId, controls);
+  GenerateStreamAndWaitForResult(kPageRequestId, controls, expectation);
   EXPECT_FALSE(audio_device(/*stream_index=*/0u).has_value());
   EXPECT_TRUE(video_device(/*stream_index=*/0u).has_value());
   const std::string label1 = host_->label_;

content/browser/renderer_host/media/media_stream_manager.cc

@@ -2119,7 +2119,7 @@ MediaStreamDevices MediaStreamManager::GetDevicesOpenedByRequest(
   DeviceRequest* request = FindRequest(label);
   if (!request)
     return MediaStreamDevices();
-  return blink::StreamDevicesToMediaStreamDevicesList(request->devices);
+  return blink::ToMediaStreamDevicesList(request->devices);
 }
 
 bool MediaStreamManager::FindExistingRequestedDevice(
@@ -2407,8 +2407,7 @@ void MediaStreamManager::FinalizeOpenDevice(const std::string& label,
   if (request->open_device_cb) {
     std::move(request->open_device_cb)
         .Run(true /* success */, label,
-             blink::StreamDevicesToMediaStreamDevicesList(request->devices)
-                 .front());
+             blink::ToMediaStreamDevicesList(request->devices).front());
   }
 }
 
@@ -2739,9 +2738,19 @@ void MediaStreamManager::AddLogMessageOnIOThread(const std::string& message) {
 void MediaStreamManager::HandleAccessRequestResponse(
     const std::string& label,
     const media::AudioParameters& output_parameters,
-    const blink::mojom::StreamDevices& devices,
+    const blink::mojom::StreamDevicesSet& devices_set,
     MediaStreamRequestResult result) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DCHECK((result == MediaStreamRequestResult::OK &&
+          devices_set.stream_devices.size() == 1u) ||
+         (result != MediaStreamRequestResult::OK &&
+          devices_set.stream_devices.empty()));
+
+  blink::mojom::StreamDevices devices;
+  if (result == MediaStreamRequestResult::OK) {
+    DCHECK_EQ(1u, devices_set.stream_devices.size());
+    devices = *devices_set.stream_devices[0];
+  }
   DeviceRequest* request = FindRequest(label);
   if (!request) {
     // The request has been canceled before the UI returned.
@@ -3251,8 +3260,7 @@ void MediaStreamManager::OnStreamStarted(const std::string& label) {
       RequestTypeToString(request->request_type())));
 
   MediaStreamUI::SourceCallback device_changed_cb;
-  if (EnableChangeSource(
-          blink::StreamDevicesToMediaStreamDevicesList(request->devices)) &&
+  if (EnableChangeSource(blink::ToMediaStreamDevicesList(request->devices)) &&
       base::FeatureList::IsEnabled(features::kDesktopCaptureChangeSource)) {
     device_changed_cb = base::BindRepeating(
         &MediaStreamManager::ChangeMediaStreamSourceFromBrowser,
@@ -3573,7 +3581,12 @@ void MediaStreamManager::MaybeUpdateTrackedCaptureHandleConfigs(
     GlobalRenderFrameHostId capturer) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
-  blink::mojom::StreamDevices filtered_new_devices;
+  blink::mojom::StreamDevicesSetPtr filtered_new_devices_set =
+      blink::mojom::StreamDevicesSet::New();
+  filtered_new_devices_set->stream_devices.emplace_back(
+      blink::mojom::StreamDevices::New());
+  blink::mojom::StreamDevices& filtered_new_devices =
+      *filtered_new_devices_set->stream_devices[0];
   if (new_devices.video_device.has_value() &&
       WebContentsMediaCaptureId::Parse(new_devices.video_device->id, nullptr)) {
     filtered_new_devices.video_device = new_devices.video_device.value();
@@ -3587,7 +3600,7 @@ void MediaStreamManager::MaybeUpdateTrackedCaptureHandleConfigs(
       base::BindOnce(
           &CaptureHandleManager::OnTabCaptureDevicesUpdated,
           base::Unretained(&capture_handle_manager_), label,
-          std::move(filtered_new_devices), capturer,
+          std::move(filtered_new_devices_set), capturer,
           base::BindPostTask(
               GetIOThreadTaskRunner({}),
               base::BindRepeating(&MediaStreamManager::OnCaptureHandleChange,

content/browser/renderer_host/media/media_stream_manager.h

@@ -459,7 +459,7 @@ class CONTENT_EXPORT MediaStreamManager
   void HandleAccessRequestResponse(
       const std::string& label,
       const media::AudioParameters& output_parameters,
-      const blink::mojom::StreamDevices& devices,
+      const blink::mojom::StreamDevicesSet& devices_set,
       blink::mojom::MediaStreamRequestResult result);
   void HandleChangeSourceRequestResponse(
       const std::string& label,

content/browser/renderer_host/media/media_stream_ui_proxy.cc

@@ -72,10 +72,19 @@ class MediaStreamUIProxy::Core {
                 bool is_from_timer);
 #endif
 
+  // The type blink::mojom::StreamDevices is not movable, therefore stream
+  // devices cannot be captured for usage with PostTask.
+  void ProcessAccessRequestResponseForPostTask(
+      int render_process_id,
+      int render_frame_id,
+      blink::mojom::StreamDevicesSetPtr stream_devices_set_ptr,
+      blink::mojom::MediaStreamRequestResult result,
+      std::unique_ptr<MediaStreamUI> stream_ui);
+
   void ProcessAccessRequestResponse(
       int render_process_id,
       int render_frame_id,
-      const blink::mojom::StreamDevices& devices,
+      const blink::mojom::StreamDevicesSet& stream_devices_set,
       blink::mojom::MediaStreamRequestResult result,
       std::unique_ptr<MediaStreamUI> stream_ui);
 
@@ -137,7 +146,7 @@ void MediaStreamUIProxy::Core::RequestAccess(
   if (!render_delegate) {
     ProcessAccessRequestResponse(
         request->render_process_id, request->render_frame_id,
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::FAILED_DUE_TO_SHUTDOWN,
         std::unique_ptr<MediaStreamUI>());
     return;
@@ -213,15 +222,40 @@ void MediaStreamUIProxy::Core::SetFocus(const DesktopMediaID& media_id,
 }
 #endif
 
-void MediaStreamUIProxy::Core::ProcessAccessRequestResponse(
+void MediaStreamUIProxy::Core::ProcessAccessRequestResponseForPostTask(
     int render_process_id,
     int render_frame_id,
-    const blink::mojom::StreamDevices& devices,
+    blink::mojom::StreamDevicesSetPtr stream_devices_set_ptr,
     blink::mojom::MediaStreamRequestResult result,
     std::unique_ptr<MediaStreamUI> stream_ui) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  DCHECK(stream_devices_set_ptr);
+  ProcessAccessRequestResponse(render_process_id, render_frame_id,
+                               *stream_devices_set_ptr, result,
+                               std::move(stream_ui));
+}
+
+void MediaStreamUIProxy::Core::ProcessAccessRequestResponse(
+    int render_process_id,
+    int render_frame_id,
+    const blink::mojom::StreamDevicesSet& stream_devices_set,
+    blink::mojom::MediaStreamRequestResult result,
+    std::unique_ptr<MediaStreamUI> stream_ui) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  DCHECK((result != blink::mojom::MediaStreamRequestResult::OK &&
+          stream_devices_set.stream_devices.empty()) ||
+         (result == blink::mojom::MediaStreamRequestResult::OK &&
+          stream_devices_set.stream_devices.size() == 1u));
+
+  blink::mojom::StreamDevicesSetPtr filtered_devices_set =
+      blink::mojom::StreamDevicesSet::New();
+  blink::mojom::StreamDevices devices;
+  if (!stream_devices_set.stream_devices.empty()) {
+    devices = *stream_devices_set.stream_devices[0];
+    filtered_devices_set->stream_devices.emplace_back(
+        blink::mojom::StreamDevices::New());
+  }
 
-  blink::mojom::StreamDevices filtered_devices;
   auto* host = RenderFrameHostImpl::FromID(render_process_id, render_frame_id);
   if (devices.audio_device.has_value()) {
     const blink::MediaStreamDevice& audio_device = devices.audio_device.value();
@@ -229,7 +263,7 @@ void MediaStreamUIProxy::Core::ProcessAccessRequestResponse(
             blink::mojom::MediaStreamType::DEVICE_AUDIO_CAPTURE ||
         IsFeatureEnabled(host, tests_use_fake_render_frame_hosts_,
                          blink::mojom::PermissionsPolicyFeature::kMicrophone)) {
-      filtered_devices.audio_device = audio_device;
+      filtered_devices_set->stream_devices[0]->audio_device = audio_device;
     }
   }
 
@@ -239,14 +273,17 @@ void MediaStreamUIProxy::Core::ProcessAccessRequestResponse(
             blink::mojom::MediaStreamType::DEVICE_VIDEO_CAPTURE ||
         IsFeatureEnabled(host, tests_use_fake_render_frame_hosts_,
                          blink::mojom::PermissionsPolicyFeature::kCamera)) {
-      filtered_devices.video_device = video_device;
+      filtered_devices_set->stream_devices[0]->video_device = video_device;
     }
   }
 
-  if (!filtered_devices.audio_device.has_value() &&
-      !filtered_devices.video_device.has_value() &&
-      result == blink::mojom::MediaStreamRequestResult::OK)
+  if ((filtered_devices_set->stream_devices.empty() ||
+       (!filtered_devices_set->stream_devices[0]->audio_device.has_value() &&
+        !filtered_devices_set->stream_devices[0]->video_device.has_value())) &&
+      result == blink::mojom::MediaStreamRequestResult::OK) {
     result = blink::mojom::MediaStreamRequestResult::PERMISSION_DENIED;
+    filtered_devices_set->stream_devices.clear();
+  }
 
   if (stream_ui) {
     // Callbacks that were supplied to the existing `ui_` are no longer
@@ -264,7 +301,7 @@ void MediaStreamUIProxy::Core::ProcessAccessRequestResponse(
   GetIOThreadTaskRunner({})->PostTask(
       FROM_HERE,
       base::BindOnce(&MediaStreamUIProxy::ProcessAccessRequestResponse, proxy_,
-                     std::move(filtered_devices), result));
+                     std::move(filtered_devices_set), result));
 }
 
 void MediaStreamUIProxy::Core::ProcessStopRequestFromUI() {
@@ -407,11 +444,11 @@ void MediaStreamUIProxy::SetFocus(const DesktopMediaID& media_id,
 #endif
 
 void MediaStreamUIProxy::ProcessAccessRequestResponse(
-    const blink::mojom::StreamDevices& devices,
+    blink::mojom::StreamDevicesSetPtr stream_devices_set,
     blink::mojom::MediaStreamRequestResult result) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK(!response_callback_.is_null());
-  std::move(response_callback_).Run(devices, result);
+  std::move(response_callback_).Run(*stream_devices_set, result);
 }
 
 void MediaStreamUIProxy::ProcessStopRequestFromUI() {
@@ -482,9 +519,9 @@ void FakeMediaStreamUIProxy::RequestAccess(
     GetUIThreadTaskRunner({})->PostTask(
         FROM_HERE,
         base::BindOnce(
-            &MediaStreamUIProxy::Core::ProcessAccessRequestResponse,
+            &MediaStreamUIProxy::Core::ProcessAccessRequestResponseForPostTask,
             core_->GetWeakPtr(), request->render_process_id,
-            request->render_frame_id, blink::mojom::StreamDevices(),
+            request->render_frame_id, blink::mojom::StreamDevicesSet::New(),
             blink::mojom::MediaStreamRequestResult::PERMISSION_DENIED,
             std::unique_ptr<MediaStreamUI>()));
     return;
@@ -492,7 +529,12 @@ void FakeMediaStreamUIProxy::RequestAccess(
 
   // Use the first capture device of the same media type in the list for the
   // fake UI.
-  blink::mojom::StreamDevices devices_to_use;
+  blink::mojom::StreamDevicesSetPtr devices_set_to_use =
+      blink::mojom::StreamDevicesSet::New();
+  devices_set_to_use->stream_devices.emplace_back(
+      blink::mojom::StreamDevices::New());
+  blink::mojom::StreamDevices& devices_to_use =
+      *devices_set_to_use->stream_devices[0];
   for (const blink::MediaStreamDevice& device : devices_) {
     if (!devices_to_use.audio_device.has_value() &&
         blink::IsAudioInputMediaType(request->audio_type) &&
@@ -519,15 +561,18 @@ void FakeMediaStreamUIProxy::RequestAccess(
 
   const bool is_devices_empty = !devices_to_use.audio_device.has_value() &&
                                 !devices_to_use.video_device.has_value();
+  if (is_devices_empty) {
+    devices_set_to_use->stream_devices.clear();
+  }
   GetUIThreadTaskRunner({})->PostTask(
       FROM_HERE,
-      base::BindOnce(&MediaStreamUIProxy::Core::ProcessAccessRequestResponse,
-                     core_->GetWeakPtr(), request->render_process_id,
-                     request->render_frame_id, devices_to_use,
-                     is_devices_empty
-                         ? blink::mojom::MediaStreamRequestResult::NO_HARDWARE
-                         : blink::mojom::MediaStreamRequestResult::OK,
-                     std::unique_ptr<MediaStreamUI>()));
+      base::BindOnce(
+          &MediaStreamUIProxy::Core::ProcessAccessRequestResponseForPostTask,
+          core_->GetWeakPtr(), request->render_process_id,
+          request->render_frame_id, std::move(devices_set_to_use),
+          is_devices_empty ? blink::mojom::MediaStreamRequestResult::NO_HARDWARE
+                           : blink::mojom::MediaStreamRequestResult::OK,
+          std::unique_ptr<MediaStreamUI>()));
 }
 
 void FakeMediaStreamUIProxy::OnStarted(

content/browser/renderer_host/media/media_stream_ui_proxy.h

@@ -29,9 +29,9 @@ class RenderFrameHostDelegate;
 // be created, used and destroyed on the IO thread.
 class CONTENT_EXPORT MediaStreamUIProxy {
  public:
-  using ResponseCallback =
-      base::OnceCallback<void(const blink::mojom::StreamDevices& devices,
-                              blink::mojom::MediaStreamRequestResult result)>;
+  using ResponseCallback = base::OnceCallback<void(
+      const blink::mojom::StreamDevicesSet& stream_devices_set,
+      blink::mojom::MediaStreamRequestResult result)>;
 
   using WindowIdCallback =
       base::OnceCallback<void(gfx::NativeViewId window_id)>;
@@ -117,7 +117,7 @@ class CONTENT_EXPORT MediaStreamUIProxy {
   friend class FakeMediaStreamUIProxy;
 
   void ProcessAccessRequestResponse(
-      const blink::mojom::StreamDevices& devices,
+      blink::mojom::StreamDevicesSetPtr stream_devices_set,
       blink::mojom::MediaStreamRequestResult result);
   void ProcessStopRequestFromUI();
   void ProcessChangeSourceRequestFromUI(const DesktopMediaID& media_id);

content/browser/renderer_host/media/media_stream_ui_proxy_unittest.cc

@@ -39,7 +39,7 @@ namespace {
 class MockRenderFrameHostDelegate : public RenderFrameHostDelegate {
  public:
   void RequestMediaAccessPermission(const MediaStreamRequest& request,
-                                    MediaResponseCallback callback) {
+                                    MediaResponseCallback callback) override {
     return RequestMediaAccessPermission(request, &callback);
   }
   const blink::web_pref::WebPreferences& GetOrCreateWebPreferences() override {
@@ -60,7 +60,7 @@ class MockRenderFrameHostDelegate : public RenderFrameHostDelegate {
 class MockResponseCallback {
  public:
   MOCK_METHOD2(OnAccessRequestResponse,
-               void(const blink::mojom::StreamDevices& devices,
+               void(const blink::mojom::StreamDevicesSet& stream_devices_set,
                     blink::mojom::MediaStreamRequestResult result));
   MOCK_METHOD1(OnCheckResponse, void(bool have_access));
 };
@@ -153,19 +153,22 @@ TEST_F(MediaStreamUIProxyTest, Deny) {
   base::RunLoop().RunUntilIdle();
   ASSERT_FALSE(callback.is_null());
 
-  std::move(callback).Run(blink::mojom::StreamDevices(),
+  blink::mojom::StreamDevicesSet stream_devices_set;
+  stream_devices_set.stream_devices.emplace_back(
+      blink::mojom::StreamDevices::New());
+  std::move(callback).Run(stream_devices_set,
                           blink::mojom::MediaStreamRequestResult::OK,
                           std::unique_ptr<MediaStreamUI>());
 
-  blink::mojom::StreamDevices response;
+  blink::mojom::StreamDevicesSetPtr response;
   EXPECT_CALL(response_callback_, OnAccessRequestResponse(_, _))
-      .WillOnce([&response](const blink::mojom::StreamDevices& arg0,
+      .WillOnce([&response](const blink::mojom::StreamDevicesSet& arg0,
                             blink::mojom::MediaStreamRequestResult arg1) {
-        response = arg0;
+        response = arg0.Clone();
       });
   base::RunLoop().RunUntilIdle();
 
-  EXPECT_TRUE(blink::StreamDevicesToMediaStreamDevicesList(response).empty());
+  EXPECT_TRUE(blink::ToMediaStreamDevicesList(*response).empty());
 }
 
 TEST_F(MediaStreamUIProxyTest, AcceptAndStart) {
@@ -189,28 +192,31 @@ TEST_F(MediaStreamUIProxyTest, AcceptAndStart) {
   base::RunLoop().RunUntilIdle();
   ASSERT_FALSE(callback.is_null());
 
-  blink::mojom::StreamDevices devices;
+  blink::mojom::StreamDevicesSet stream_devices_set;
+  stream_devices_set.stream_devices.emplace_back(
+      blink::mojom::StreamDevices::New());
+  blink::mojom::StreamDevices& devices = *stream_devices_set.stream_devices[0];
   devices.audio_device = blink::MediaStreamDevice(
       blink::mojom::MediaStreamType::DEVICE_AUDIO_CAPTURE, "Mic", "Mic");
   auto ui = std::make_unique<MockMediaStreamUI>();
   EXPECT_CALL(*ui, MockOnStarted(_, _)).WillOnce(Return(0));
-  std::move(callback).Run(std::move(devices),
+  std::move(callback).Run(stream_devices_set,
                           blink::mojom::MediaStreamRequestResult::OK,
                           std::move(ui));
 
-  blink::mojom::StreamDevices response;
+  blink::mojom::StreamDevicesSetPtr response;
   EXPECT_CALL(response_callback_, OnAccessRequestResponse(_, _))
-      .WillOnce([&response](const blink::mojom::StreamDevices& arg0,
+      .WillOnce([&response](const blink::mojom::StreamDevicesSet& arg0,
                             blink::mojom::MediaStreamRequestResult arg1) {
-        response = arg0;
+        response = arg0.Clone();
       });
   base::RunLoop().RunUntilIdle();
 
-  EXPECT_FALSE(blink::StreamDevicesToMediaStreamDevicesList(response).empty());
+  EXPECT_FALSE(blink::ToMediaStreamDevicesList(*response).empty());
 
   proxy_->OnStarted(base::OnceClosure(), MediaStreamUI::SourceCallback(),
                     MediaStreamUIProxy::WindowIdCallback(),
-                    /*label=*/std::string(), /*screen_capture_ids=*/{},
+                    /*label=*/std::string(), /*screen_share_ids=*/{},
                     MediaStreamUI::StateChangeCallback());
   base::RunLoop().RunUntilIdle();
 }
@@ -240,7 +246,10 @@ TEST_F(MediaStreamUIProxyTest, DeleteBeforeAccepted) {
   proxy_.reset();
 
   std::unique_ptr<MediaStreamUI> ui;
-  std::move(callback).Run(blink::mojom::StreamDevices(),
+  blink::mojom::StreamDevicesSet stream_devices_set;
+  stream_devices_set.stream_devices.emplace_back(
+      blink::mojom::StreamDevices::New());
+  std::move(callback).Run(stream_devices_set,
                           blink::mojom::MediaStreamRequestResult::OK,
                           std::move(ui));
 }
@@ -268,7 +277,10 @@ TEST_F(MediaStreamUIProxyTest, StopFromUI) {
 
   base::OnceClosure stop_callback;
 
-  blink::mojom::StreamDevices devices;
+  blink::mojom::StreamDevicesSet stream_devices_set;
+  stream_devices_set.stream_devices.emplace_back(
+      blink::mojom::StreamDevices::New());
+  blink::mojom::StreamDevices& devices = *stream_devices_set.stream_devices[0];
   devices.audio_device = blink::MediaStreamDevice(
       blink::mojom::MediaStreamType::DEVICE_AUDIO_CAPTURE, "Mic", "Mic");
   auto ui = std::make_unique<MockMediaStreamUI>();
@@ -278,26 +290,26 @@ TEST_F(MediaStreamUIProxyTest, StopFromUI) {
         return 0;
       });
 
-  std::move(callback).Run(std::move(devices),
+  std::move(callback).Run(stream_devices_set,
                           blink::mojom::MediaStreamRequestResult::OK,
                           std::move(ui));
 
-  blink::mojom::StreamDevices response;
+  blink::mojom::StreamDevicesSetPtr response;
   EXPECT_CALL(response_callback_, OnAccessRequestResponse(_, _))
-      .WillOnce([&response](const blink::mojom::StreamDevices& arg0,
+      .WillOnce([&response](const blink::mojom::StreamDevicesSet& arg0,
                             blink::mojom::MediaStreamRequestResult arg1) {
-        response = arg0;
+        response = arg0.Clone();
       });
   base::RunLoop().RunUntilIdle();
 
-  EXPECT_FALSE(blink::StreamDevicesToMediaStreamDevicesList(response).empty());
+  EXPECT_FALSE(blink::ToMediaStreamDevicesList(*response).empty());
 
   MockStopStreamHandler stop_handler;
   proxy_->OnStarted(base::BindOnce(&MockStopStreamHandler::OnStop,
                                    base::Unretained(&stop_handler)),
                     MediaStreamUI::SourceCallback(),
                     MediaStreamUIProxy::WindowIdCallback(),
-                    /*label=*/std::string(), /*screen_capture_ids=*/{},
+                    /*label=*/std::string(), /*screen_share_ids=*/{},
                     MediaStreamUI::StateChangeCallback());
   base::RunLoop().RunUntilIdle();
 
@@ -331,7 +343,10 @@ TEST_F(MediaStreamUIProxyTest, WindowIdCallbackCalled) {
   auto ui = std::make_unique<MockMediaStreamUI>();
   EXPECT_CALL(*ui, MockOnStarted(_, _)).WillOnce(Return(kWindowId));
 
-  std::move(callback).Run(blink::mojom::StreamDevices(),
+  blink::mojom::StreamDevicesSet stream_devices_set;
+  stream_devices_set.stream_devices.emplace_back(
+      blink::mojom::StreamDevices::New());
+  std::move(callback).Run(stream_devices_set,
                           blink::mojom::MediaStreamRequestResult::OK,
                           std::move(ui));
   EXPECT_CALL(response_callback_, OnAccessRequestResponse(_, _));
@@ -344,7 +359,7 @@ TEST_F(MediaStreamUIProxyTest, WindowIdCallbackCalled) {
                     MediaStreamUI::SourceCallback(),
                     base::BindOnce(&MockStopStreamHandler::OnWindowId,
                                    base::Unretained(&handler)),
-                    /*label=*/std::string(), /*screen_capture_ids=*/{},
+                    /*label=*/std::string(), /*screen_share_ids=*/{},
                     MediaStreamUI::StateChangeCallback());
   base::RunLoop().RunUntilIdle();
 }
@@ -372,29 +387,31 @@ TEST_F(MediaStreamUIProxyTest, ChangeSourceFromUI) {
 
   MediaStreamUI::SourceCallback source_callback;
 
-  blink::mojom::StreamDevices devices;
+  blink::mojom::StreamDevicesSet stream_devices_set;
+  stream_devices_set.stream_devices.emplace_back(
+      blink::mojom::StreamDevices::New());
+  blink::mojom::StreamDevices& devices = *stream_devices_set.stream_devices[0];
   devices.video_device = blink::MediaStreamDevice(
       blink::mojom::MediaStreamType::GUM_DESKTOP_VIDEO_CAPTURE,
       "fake_desktop_video_device", "Fake Desktop Video Device");
   auto ui = std::make_unique<MockMediaStreamUI>();
-  EXPECT_CALL(*ui, MockOnStarted(_, _))
-      .WillOnce([&source_callback](auto, auto callback) {
-        source_callback = std::move(callback);
-        return 0;
-      });
-  std::move(callback).Run(std::move(devices),
+  EXPECT_CALL(*ui, MockOnStarted(_, _)).WillOnce([&](auto, auto callback) {
+    source_callback = std::move(callback);
+    return 0;
+  });
+  std::move(callback).Run(stream_devices_set,
                           blink::mojom::MediaStreamRequestResult::OK,
                           std::move(ui));
 
-  blink::mojom::StreamDevices response;
+  blink::mojom::StreamDevicesSetPtr response;
   EXPECT_CALL(response_callback_, OnAccessRequestResponse(_, _))
-      .WillOnce([&response](const blink::mojom::StreamDevices& arg0,
+      .WillOnce([&response](const blink::mojom::StreamDevicesSet& arg0,
                             blink::mojom::MediaStreamRequestResult arg1) {
-        response = arg0;
+        response = arg0.Clone();
       });
   base::RunLoop().RunUntilIdle();
 
-  EXPECT_FALSE(blink::StreamDevicesToMediaStreamDevicesList(response).empty());
+  EXPECT_FALSE(blink::ToMediaStreamDevicesList(*response).empty());
 
   MockStopStreamHandler stop_handler;
   MockChangeSourceStreamHandler source_handler;
@@ -404,7 +421,7 @@ TEST_F(MediaStreamUIProxyTest, ChangeSourceFromUI) {
       base::BindRepeating(&MockChangeSourceStreamHandler::OnChangeSource,
                           base::Unretained(&source_handler)),
       MediaStreamUIProxy::WindowIdCallback(), /*label=*/std::string(),
-      /*screen_capture_ids=*/{}, MediaStreamUI::StateChangeCallback());
+      /*screen_share_ids=*/{}, MediaStreamUI::StateChangeCallback());
   base::RunLoop().RunUntilIdle();
 
   ASSERT_FALSE(source_callback.is_null());
@@ -436,7 +453,10 @@ TEST_F(MediaStreamUIProxyTest, ChangeTabSourceFromUI) {
 
   MediaStreamUI::SourceCallback source_callback;
 
-  blink::mojom::StreamDevices devices;
+  blink::mojom::StreamDevicesSet stream_devices_set;
+  stream_devices_set.stream_devices.emplace_back(
+      blink::mojom::StreamDevices::New());
+  blink::mojom::StreamDevices& devices = *stream_devices_set.stream_devices[0];
   devices.video_device = blink::MediaStreamDevice(
       blink::mojom::MediaStreamType::GUM_TAB_VIDEO_CAPTURE,
       "fake_tab_video_device", "Fake Tab Video Device");
@@ -448,20 +468,20 @@ TEST_F(MediaStreamUIProxyTest, ChangeTabSourceFromUI) {
         stop_callback = std::move(stop);
         return 0;
       });
-  std::move(callback).Run(std::move(devices),
+  std::move(callback).Run(stream_devices_set,
                           blink::mojom::MediaStreamRequestResult::OK,
                           std::move(ui));
 
-  blink::mojom::StreamDevices response;
+  blink::mojom::StreamDevicesSetPtr response;
   EXPECT_CALL(response_callback_, OnAccessRequestResponse(_, _))
       .Times(2)
-      .WillRepeatedly([&response](const blink::mojom::StreamDevices& arg0,
-                                  blink::mojom::MediaStreamRequestResult arg1) {
-        response = arg0;
+      .WillRepeatedly([&](const blink::mojom::StreamDevicesSet& arg0,
+                          blink::mojom::MediaStreamRequestResult arg1) {
+        response = arg0.Clone();
       });
   base::RunLoop().RunUntilIdle();
 
-  EXPECT_FALSE(blink::StreamDevicesToMediaStreamDevicesList(response).empty());
+  EXPECT_FALSE(blink::ToMediaStreamDevicesList(*response).empty());
 
   MockStopStreamHandler stop_handler;
   // No stop event should be triggered.
@@ -505,7 +525,7 @@ TEST_F(MediaStreamUIProxyTest, ChangeTabSourceFromUI) {
       blink::mojom::MediaStreamType::GUM_TAB_VIDEO_CAPTURE,
       "fake_tab_video_device", "Fake Tab Video Device");
 
-  std::move(callback).Run(std::move(devices),
+  std::move(callback).Run(stream_devices_set,
                           blink::mojom::MediaStreamRequestResult::OK,
                           std::make_unique<MockMediaStreamUI>());
 
@@ -571,7 +591,11 @@ class MediaStreamUIProxyPermissionsPolicyTest
    public:
     void RequestMediaAccessPermission(const MediaStreamRequest& request,
                                       MediaResponseCallback callback) override {
-      blink::mojom::StreamDevices devices;
+      blink::mojom::StreamDevicesSet stream_devices_set;
+      stream_devices_set.stream_devices.emplace_back(
+          blink::mojom::StreamDevices::New());
+      blink::mojom::StreamDevices& devices =
+          *stream_devices_set.stream_devices[0];
       if (request.audio_type ==
           blink::mojom::MediaStreamType::DEVICE_AUDIO_CAPTURE) {
         devices.audio_device = blink::MediaStreamDevice(
@@ -584,7 +608,7 @@ class MediaStreamUIProxyPermissionsPolicyTest
             "Camera");
       }
       auto ui = std::make_unique<MockMediaStreamUI>();
-      std::move(callback).Run(std::move(devices),
+      std::move(callback).Run(stream_devices_set,
                               blink::mojom::MediaStreamRequestResult::OK,
                               std::move(ui));
     }
@@ -610,7 +634,7 @@ class MediaStreamUIProxyPermissionsPolicyTest
   }
 
   void FinishedGetResultOnIOThread(
-      const blink::mojom::StreamDevices& devices,
+      const blink::mojom::StreamDevicesSet& stream_devices_set,
       blink::mojom::MediaStreamRequestResult result) {
     DCHECK_CURRENTLY_ON(BrowserThread::IO);
     proxy_.reset();
@@ -618,13 +642,13 @@ class MediaStreamUIProxyPermissionsPolicyTest
         FROM_HERE,
         base::BindOnce(
             &MediaStreamUIProxyPermissionsPolicyTest::FinishedGetResult,
-            base::Unretained(this), devices, result));
+            base::Unretained(this), stream_devices_set.Clone(), result));
   }
 
-  void FinishedGetResult(const blink::mojom::StreamDevices& devices,
+  void FinishedGetResult(blink::mojom::StreamDevicesSetPtr stream_devices_set,
                          blink::mojom::MediaStreamRequestResult result) {
     DCHECK_CURRENTLY_ON(BrowserThread::UI);
-    devices_ = blink::StreamDevicesToMediaStreamDevicesList(devices);
+    devices_ = blink::ToMediaStreamDevicesList(*stream_devices_set);
     result_ = result;
     std::move(quit_closure_).Run();
   }

content/browser/renderer_host/render_frame_host_delegate.cc

@@ -44,7 +44,7 @@ void RenderFrameHostDelegate::RequestMediaAccessPermission(
     MediaResponseCallback callback) {
   LOG(ERROR) << "RenderFrameHostDelegate::RequestMediaAccessPermission: "
              << "Not supported.";
-  std::move(callback).Run(blink::mojom::StreamDevices(),
+  std::move(callback).Run(blink::mojom::StreamDevicesSet(),
                           blink::mojom::MediaStreamRequestResult::NOT_SUPPORTED,
                           std::unique_ptr<MediaStreamUI>());
 }

content/browser/speech/speech_recognition_manager_impl.cc

@@ -307,9 +307,9 @@ void SpeechRecognitionManagerImpl::MediaRequestPermissionCallback(
   // which is only supported in combination with the getDisplayMediaSet API.
   DCHECK_EQ(stream_devices_set.stream_devices.size(), 1u);
   DCHECK(stream_devices_set.stream_devices[0]);
+
   blink::MediaStreamDevices devices_list =
-      blink::StreamDevicesToMediaStreamDevicesList(
-          *stream_devices_set.stream_devices[0]);
+      blink::ToMediaStreamDevicesList(stream_devices_set);
   const bool is_allowed = !devices_list.empty();
   if (is_allowed) {
     // Copy the approved devices array to the context for UI indication.

content/browser/web_contents/web_contents_impl.cc

@@ -4285,7 +4285,7 @@ void WebContentsImpl::RequestMediaAccessPermission(
     delegate_->RequestMediaAccessPermission(this, request, std::move(callback));
   } else {
     std::move(callback).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::FAILED_DUE_TO_SHUTDOWN,
         std::unique_ptr<MediaStreamUI>());
   }

content/browser/web_contents/web_contents_impl_unittest.cc

@@ -3214,11 +3214,11 @@ TEST_F(WebContentsImplTest, RequestMediaAccessPermissionNoDelegate) {
   contents()->RequestMediaAccessPermission(
       dummy_request,
       base::BindLambdaForTesting(
-          [&callback_run](const blink::mojom::StreamDevices& stream_devices,
-                          blink::mojom::MediaStreamRequestResult result,
-                          std::unique_ptr<MediaStreamUI> ui) {
-            EXPECT_FALSE(stream_devices.audio_device.has_value());
-            EXPECT_FALSE(stream_devices.video_device.has_value());
+          [&callback_run](
+              const blink::mojom::StreamDevicesSet& stream_devices_set,
+              blink::mojom::MediaStreamRequestResult result,
+              std::unique_ptr<MediaStreamUI> ui) {
+            EXPECT_TRUE(stream_devices_set.stream_devices.empty());
             EXPECT_EQ(
                 result,
                 blink::mojom::MediaStreamRequestResult::FAILED_DUE_TO_SHUTDOWN);

content/public/browser/media_stream_request.h

@@ -152,10 +152,10 @@ class MediaStreamUI {
 };
 
 // Callback used return results of media access requests.
-using MediaResponseCallback =
-    base::OnceCallback<void(const blink::mojom::StreamDevices& stream_devices,
-                            blink::mojom::MediaStreamRequestResult result,
-                            std::unique_ptr<MediaStreamUI> ui)>;
+using MediaResponseCallback = base::OnceCallback<void(
+    const blink::mojom::StreamDevicesSet& stream_devices_set,
+    blink::mojom::MediaStreamRequestResult result,
+    std::unique_ptr<MediaStreamUI> ui)>;
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_MEDIA_STREAM_REQUEST_H_

content/public/browser/web_contents_delegate.cc

@@ -220,7 +220,7 @@ void WebContentsDelegate::RequestMediaAccessPermission(
     content::MediaResponseCallback callback) {
   LOG(ERROR) << "WebContentsDelegate::RequestMediaAccessPermission: "
              << "Not supported.";
-  std::move(callback).Run(blink::mojom::StreamDevices(),
+  std::move(callback).Run(blink::mojom::StreamDevicesSet(),
                           blink::mojom::MediaStreamRequestResult::NOT_SUPPORTED,
                           std::unique_ptr<content::MediaStreamUI>());
 }

extensions/browser/guest_view/web_view/web_view_permission_helper.cc

@@ -214,7 +214,7 @@ void WebViewPermissionHelper::OnMediaPermissionResponse(
     const std::string& user_input) {
   if (!allow) {
     std::move(callback).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::PERMISSION_DENIED,
         std::unique_ptr<content::MediaStreamUI>());
     return;
@@ -222,7 +222,7 @@ void WebViewPermissionHelper::OnMediaPermissionResponse(
   if (!web_view_guest()->attached() ||
       !web_view_guest()->embedder_web_contents()->GetDelegate()) {
     std::move(callback).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::INVALID_STATE,
         std::unique_ptr<content::MediaStreamUI>());
     return;

extensions/browser/media_capture_util.cc

@@ -59,7 +59,11 @@ void GrantMediaStreamRequest(content::WebContents* web_contents,
          request.video_type ==
              blink::mojom::MediaStreamType::DEVICE_VIDEO_CAPTURE);
 
-  blink::mojom::StreamDevices devices;
+  // TOOD(crbug.com/1300883): Generalize to multiple streams.
+  blink::mojom::StreamDevicesSet stream_devices_set;
+  stream_devices_set.stream_devices.emplace_back(
+      blink::mojom::StreamDevices::New());
+  blink::mojom::StreamDevices& devices = *stream_devices_set.stream_devices[0];
 
   if (request.audio_type ==
       blink::mojom::MediaStreamType::DEVICE_AUDIO_CAPTURE) {
@@ -84,8 +88,8 @@ void GrantMediaStreamRequest(content::WebContents* web_contents,
   // TODO(jamescook): Should we show a recording icon somewhere? If so, where?
   std::unique_ptr<MediaStreamUI> ui;
   std::move(callback).Run(
-      devices,
-      devices.audio_device.has_value() || devices.video_device.has_value()
+      stream_devices_set,
+      (devices.audio_device.has_value() || devices.video_device.has_value())
           ? blink::mojom::MediaStreamRequestResult::OK
           : blink::mojom::MediaStreamRequestResult::INVALID_STATE,
       std::move(ui));

fuchsia_web/webengine/browser/frame_impl.cc

@@ -8,6 +8,7 @@
 #include <lib/fpromise/result.h>
 #include <lib/sys/cpp/component_context.h>
 #include <lib/ui/scenic/cpp/view_ref_pair.h>
+#include <algorithm>
 #include <limits>
 
 #include "base/bind.h"
@@ -206,14 +207,15 @@ void HandleMediaPermissionsRequestResult(
     const content::MediaStreamRequest& request,
     content::MediaResponseCallback callback,
     const std::vector<blink::mojom::PermissionStatus>& result) {
-  blink::mojom::StreamDevices devices;
+  // TODO(crbug.com/1300883): Generalize to multiple streams.
+  blink::mojom::StreamDevicesPtr devices = blink::mojom::StreamDevices::New();
 
   int result_pos = 0;
 
   if (request.audio_type ==
       blink::mojom::MediaStreamType::DEVICE_AUDIO_CAPTURE) {
     if (result[result_pos] == blink::mojom::PermissionStatus::GRANTED) {
-      devices.audio_device = blink::MediaStreamDevice(
+      devices->audio_device = blink::MediaStreamDevice(
           request.audio_type, request.requested_audio_device_id,
           /*name=*/"");
     }
@@ -223,15 +225,19 @@ void HandleMediaPermissionsRequestResult(
   if (request.video_type ==
       blink::mojom::MediaStreamType::DEVICE_VIDEO_CAPTURE) {
     if (result[result_pos] == blink::mojom::PermissionStatus::GRANTED) {
-      devices.video_device = blink::MediaStreamDevice(
+      devices->video_device = blink::MediaStreamDevice(
           request.video_type, request.requested_video_device_id,
           /*name=*/"");
     }
   }
 
+  blink::mojom::StreamDevicesSet stream_devices_set;
+  if (devices->audio_device.has_value() || devices->video_device.has_value()) {
+    stream_devices_set.stream_devices.emplace_back(std::move(devices));
+  }
   std::move(callback).Run(
-      devices,
-      (!devices.audio_device.has_value() && !devices.video_device.has_value())
+      stream_devices_set,
+      stream_devices_set.stream_devices.empty()
           ? blink::mojom::MediaStreamRequestResult::NO_HARDWARE
           : blink::mojom::MediaStreamRequestResult::OK,
       nullptr);
@@ -1245,7 +1251,7 @@ void FrameImpl::RequestMediaAccessPermission(
     permissions.push_back(blink::PermissionType::AUDIO_CAPTURE);
   } else if (request.audio_type != blink::mojom::MediaStreamType::NO_SERVICE) {
     std::move(callback).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::NOT_SUPPORTED, nullptr);
     return;
   }
@@ -1255,7 +1261,7 @@ void FrameImpl::RequestMediaAccessPermission(
     permissions.push_back(blink::PermissionType::VIDEO_CAPTURE);
   } else if (request.video_type != blink::mojom::MediaStreamType::NO_SERVICE) {
     std::move(callback).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::NOT_SUPPORTED, nullptr);
     return;
   }
@@ -1264,7 +1270,7 @@ void FrameImpl::RequestMediaAccessPermission(
       request.render_process_id, request.render_frame_id);
   if (!render_frame_host) {
     std::move(callback).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::INVALID_STATE, nullptr);
     return;
   }
@@ -1272,7 +1278,7 @@ void FrameImpl::RequestMediaAccessPermission(
   if (url::Origin::Create(request.security_origin) !=
       render_frame_host->GetLastCommittedOrigin()) {
     std::move(callback).Run(
-        blink::mojom::StreamDevices(),
+        blink::mojom::StreamDevicesSet(),
         blink::mojom::MediaStreamRequestResult::INVALID_SECURITY_ORIGIN,
         nullptr);
     return;

third_party/blink/common/mediastream/media_stream_request.cc

@@ -144,16 +144,31 @@ bool MediaStreamDevice::IsSameDevice(
          session_id_ == other_device.session_id_;
 }
 
-// TODO(crbug.com/1313021): Remove this function and use
-// blink::mojom::StreaDevices directly everywhere.
-blink::MediaStreamDevices StreamDevicesToMediaStreamDevicesList(
-    const blink::mojom::StreamDevices& devices) {
-  blink::MediaStreamDevices all_devices;
-  if (devices.audio_device.has_value())
-    all_devices.push_back(devices.audio_device.value());
-  if (devices.video_device.has_value())
-    all_devices.push_back(devices.video_device.value());
-  return all_devices;
+BLINK_COMMON_EXPORT MediaStreamDevices
+ToMediaStreamDevicesList(const mojom::StreamDevices& stream_devices) {
+  blink::MediaStreamDevices devices;
+  if (stream_devices.audio_device.has_value()) {
+    devices.push_back(stream_devices.audio_device.value());
+  }
+  if (stream_devices.video_device.has_value()) {
+    devices.push_back(stream_devices.video_device.value());
+  }
+  return devices;
+}
+
+blink::MediaStreamDevices ToMediaStreamDevicesList(
+    const blink::mojom::StreamDevicesSet& stream_devices_set) {
+  blink::MediaStreamDevices devices;
+  for (const blink::mojom::StreamDevicesPtr& devices_to_insert :
+       stream_devices_set.stream_devices) {
+    if (devices_to_insert->audio_device.has_value()) {
+      devices.push_back(devices_to_insert->audio_device.value());
+    }
+    if (devices_to_insert->video_device.has_value()) {
+      devices.push_back(devices_to_insert->video_device.value());
+    }
+  }
+  return devices;
 }
 
 size_t CountDevices(const blink::mojom::StreamDevices& devices) {

third_party/blink/public/common/mediastream/media_stream_request.h

@@ -125,8 +125,15 @@ struct BLINK_COMMON_EXPORT MediaStreamDevice {
 
 using MediaStreamDevices = std::vector<MediaStreamDevice>;
 
+// Takes a mojom::StreamDevices and returns all contained MediaStreamDevices.
 BLINK_COMMON_EXPORT MediaStreamDevices
-StreamDevicesToMediaStreamDevicesList(const mojom::StreamDevices& devices);
+ToMediaStreamDevicesList(const mojom::StreamDevices& stream_devices);
+
+// TODO(crbug.com/1313021): Remove this function and use
+// blink::mojom::StreamDevicesSet directly everywhere.
+// Takes a mojom::StreamDevicesSet and returns all contained MediaStreamDevices.
+BLINK_COMMON_EXPORT MediaStreamDevices
+ToMediaStreamDevicesList(const mojom::StreamDevicesSet& stream_devices_set);
 
 BLINK_COMMON_EXPORT size_t CountDevices(const mojom::StreamDevices& devices);
 

third_party/blink/renderer/modules/mediastream/user_media_processor.h

@@ -155,7 +155,7 @@ class MODULES_EXPORT UserMediaProcessor
   void OnStreamGenerated(int32_t request_id,
                          blink::mojom::blink::MediaStreamRequestResult result,
                          const String& label,
-                         mojom::blink::StreamDevicesSetPtr streams_devices_set,
+                         mojom::blink::StreamDevicesSetPtr stream_devices_set,
                          bool pan_tilt_zoom_allowed);
 
   void GotAllVideoInputFormatsForDevice(

weblayer/browser/tab_impl.cc

@@ -1130,7 +1130,7 @@ void TabImpl::RequestMediaAccessPermission(
   MediaStreamManager::FromWebContents(web_contents)
       ->RequestMediaAccessPermission(request, std::move(callback));
 #else
-  std::move(callback).Run(blink::mojom::StreamDevices(),
+  std::move(callback).Run(blink::mojom::StreamDevicesSet(),
                           blink::mojom::MediaStreamRequestResult::NOT_SUPPORTED,
                           nullptr);
 #endif

weblayer/browser/webrtc/media_stream_manager.cc

@@ -34,11 +34,14 @@ struct UserData : public base::SupportsUserData::Data {
 class MediaStreamManager::StreamUi : public content::MediaStreamUI {
  public:
   StreamUi(base::WeakPtr<MediaStreamManager> manager,
-           const blink::mojom::StreamDevices& devices)
+           const blink::mojom::StreamDevicesSet& stream_devices)
       : manager_(manager) {
     DCHECK(manager_);
-    streaming_audio_ = devices.audio_device.has_value();
-    streaming_video_ = devices.video_device.has_value();
+    DCHECK_EQ(1u, stream_devices.stream_devices.size());
+    streaming_audio_ =
+        stream_devices.stream_devices[0]->audio_device.has_value();
+    streaming_video_ =
+        stream_devices.stream_devices[0]->video_device.has_value();
   }
   StreamUi(const StreamUi&) = delete;
   StreamUi& operator=(const StreamUi&) = delete;
@@ -122,12 +125,12 @@ void MediaStreamManager::OnClientReadyToStream(JNIEnv* env,
   CHECK(request != requests_pending_client_approval_.end());
   if (allowed) {
     std::move(request->second.callback)
-        .Run(request->second.devices, request->second.result,
+        .Run(*request->second.stream_devices_set_, request->second.result,
              std::make_unique<StreamUi>(weak_factory_.GetWeakPtr(),
-                                        request->second.devices));
+                                        *request->second.stream_devices_set_));
   } else {
     std::move(request->second.callback)
-        .Run(blink::mojom::StreamDevices(),
+        .Run(blink::mojom::StreamDevicesSet(),
              blink::mojom::MediaStreamRequestResult::NO_HARDWARE, {});
   }
   requests_pending_client_approval_.erase(request);
@@ -141,22 +144,28 @@ void MediaStreamManager::StopStreaming(JNIEnv* env) {
 
 void MediaStreamManager::OnMediaAccessPermissionResult(
     content::MediaResponseCallback callback,
-    const blink::mojom::StreamDevices& devices,
+    const blink::mojom::StreamDevicesSet& stream_devices_set,
     blink::mojom::MediaStreamRequestResult result,
     bool blocked_by_permissions_policy,
     ContentSetting audio_setting,
     ContentSetting video_setting) {
+  // TODO(crbug.com/1300883): Generalize to multiple streams.
+  DCHECK((result != blink::mojom::MediaStreamRequestResult::OK &&
+          stream_devices_set.stream_devices.empty()) ||
+         (result == blink::mojom::MediaStreamRequestResult::OK &&
+          stream_devices_set.stream_devices.size() == 1u));
   if (result != blink::mojom::MediaStreamRequestResult::OK) {
-    std::move(callback).Run(devices, result, {});
+    std::move(callback).Run(stream_devices_set, result, {});
     return;
   }
 
   int request_id = next_request_id_++;
-  requests_pending_client_approval_[request_id] =
-      RequestPendingClientApproval(std::move(callback), devices, result);
+  requests_pending_client_approval_[request_id] = RequestPendingClientApproval(
+      std::move(callback), stream_devices_set, result);
   Java_MediaStreamManager_prepareToStream(
       base::android::AttachCurrentThread(), j_object_,
-      devices.audio_device.has_value(), devices.video_device.has_value(),
+      stream_devices_set.stream_devices[0]->audio_device.has_value(),
+      stream_devices_set.stream_devices[0]->video_device.has_value(),
       request_id);
 }
 
@@ -199,9 +208,11 @@ MediaStreamManager::RequestPendingClientApproval::
 
 MediaStreamManager::RequestPendingClientApproval::RequestPendingClientApproval(
     content::MediaResponseCallback callback,
-    const blink::mojom::StreamDevices& devices,
+    const blink::mojom::StreamDevicesSet& stream_devices_set,
     blink::mojom::MediaStreamRequestResult result)
-    : callback(std::move(callback)), devices(devices), result(result) {}
+    : callback(std::move(callback)),
+      stream_devices_set_(stream_devices_set.Clone()),
+      result(result) {}
 
 MediaStreamManager::RequestPendingClientApproval::
     ~RequestPendingClientApproval() = default;

weblayer/browser/webrtc/media_stream_manager.h

@@ -57,7 +57,7 @@ class MediaStreamManager {
 
   void OnMediaAccessPermissionResult(
       content::MediaResponseCallback callback,
-      const blink::mojom::StreamDevices& devices,
+      const blink::mojom::StreamDevicesSet& stream_devices_set,
       blink::mojom::MediaStreamRequestResult result,
       bool blocked_by_permissions_policy,
       ContentSetting audio_setting,
@@ -73,16 +73,17 @@ class MediaStreamManager {
   // approval.
   struct RequestPendingClientApproval {
     RequestPendingClientApproval();
-    RequestPendingClientApproval(content::MediaResponseCallback callback,
-                                 const blink::mojom::StreamDevices& devices,
-                                 blink::mojom::MediaStreamRequestResult result);
+    RequestPendingClientApproval(
+        content::MediaResponseCallback callback,
+        const blink::mojom::StreamDevicesSet& stream_devices_set,
+        blink::mojom::MediaStreamRequestResult result);
     ~RequestPendingClientApproval();
 
     RequestPendingClientApproval& operator=(
         RequestPendingClientApproval&& other);
 
     content::MediaResponseCallback callback;
-    blink::mojom::StreamDevices devices;
+    blink::mojom::StreamDevicesSetPtr stream_devices_set_;
     blink::mojom::MediaStreamRequestResult result;
   };
   std::map<int, RequestPendingClientApproval> requests_pending_client_approval_;