[Cast Streaming] Change Fuchsia to use Remoting path

This CL updates Fuchsia to use the remoting infrastructure rather than
the legacy non-remoting paths in `cast_streaming`. This both improves
the playback delay for Fuchsia mirroring as well as takes a step
closer to supporting remoting on Fuchsia

NOTE: Remoting support will not be "turned on" for fuchsia until the
initial config used to start cast_streaming is updated to state that
remoting is supported

Bug: 1370809, internal b/230897148
Change-Id: I2aff6e5b7a69881e7cb889100218d3ac73797edd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4148222
Commit-Queue: Ryan Keane <rwkeane@google.com>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1096496}

fuchsia_web/webengine/BUILD.gn

@@ -260,7 +260,11 @@ component("web_engine_core") {
   ]
 
   if (enable_cast_receiver) {
-    deps += [ "//components/fuchsia_legacymetrics" ]
+    deps += [
+      "//components/cast_streaming/public",
+      "//components/cast_streaming/public/mojom",
+      "//components/fuchsia_legacymetrics",
+    ]
   }
 
   if (enable_widevine) {

fuchsia_web/webengine/browser/DEPS

@@ -1,6 +1,7 @@
 include_rules = [
   # Do NOT add components/cast or other Cast-specific code to this file.
   "+cc/base",
+  "+components/cast_streaming/public",
   "+components/client_hints/browser",
   "+components/favicon/content",
   "+components/favicon/core",

fuchsia_web/webengine/browser/frame_impl.cc

@@ -78,6 +78,9 @@
 #include "url/origin.h"
 
 #if BUILDFLAG(ENABLE_CAST_RECEIVER)
+#include "components/cast_streaming/public/features.h"  //nogncheck
+#include "components/cast_streaming/public/mojom/demuxer_connector.mojom.h"  //nogncheck
+#include "components/cast_streaming/public/mojom/renderer_controller.mojom.h"  //nogncheck
 #include "fuchsia_web/webengine/browser/receiver_session_client.h"  //nogncheck
 #include "fuchsia_web/webengine/common/cast_streaming.h"            // nogncheck
 #endif
@@ -766,12 +769,18 @@ void FrameImpl::MaybeStartCastStreaming(
 
   mojo::AssociatedRemote<cast_streaming::mojom::DemuxerConnector>
       demuxer_connector;
-  navigation_handle->GetRenderFrameHost()
-      ->GetRemoteAssociatedInterfaces()
-      ->GetInterface(&demuxer_connector);
-  receiver_session_client_->SetDemuxerConnector(std::move(demuxer_connector));
+  mojo::AssociatedRemote<cast_streaming::mojom::RendererController>
+      renderer_controller;
+  auto* remote_interfaces =
+      navigation_handle->GetRenderFrameHost()->GetRemoteAssociatedInterfaces();
+  remote_interfaces->GetInterface(&demuxer_connector);
+  if (cast_streaming::IsCastRemotingEnabled()) {
+    remote_interfaces->GetInterface(&renderer_controller);
+  }
+  receiver_session_client_->SetMojoEndpoints(std::move(demuxer_connector),
+                                             std::move(renderer_controller));
 }
-#endif
+#endif  // BUILDFLAG(ENABLE_CAST_RECEIVER)
 
 void FrameImpl::UpdateRenderFrameZoomLevel(
     content::RenderFrameHost* render_frame_host) {

fuchsia_web/webengine/browser/receiver_session_client.cc

@@ -23,9 +23,11 @@ ReceiverSessionClient::ReceiverSessionClient(
 
 ReceiverSessionClient::~ReceiverSessionClient() = default;
 
-void ReceiverSessionClient::SetDemuxerConnector(
+void ReceiverSessionClient::SetMojoEndpoints(
     mojo::AssociatedRemote<cast_streaming::mojom::DemuxerConnector>
-        demuxer_connector) {
+        demuxer_connector,
+    mojo::AssociatedRemote<cast_streaming::mojom::RendererController>
+        renderer_controller) {
   DCHECK(message_port_request_);
 
   // TODO: Add streaming session Constraints based on system capabilities
@@ -55,7 +57,12 @@ void ReceiverSessionClient::SetDemuxerConnector(
                 std::move(port));
           },
           std::move(message_port_request_)));
-  receiver_session_->StartStreamingAsync(std::move(demuxer_connector));
+  if (renderer_controller) {
+    receiver_session_->StartStreamingAsync(std::move(demuxer_connector),
+                                           std::move(renderer_controller));
+  } else {
+    receiver_session_->StartStreamingAsync(std::move(demuxer_connector));
+  }
 }
 
 bool ReceiverSessionClient::HasReceiverSession() {

fuchsia_web/webengine/browser/receiver_session_client.h

@@ -8,6 +8,7 @@
 #include <fuchsia/web/cpp/fidl.h>
 
 #include "components/cast_streaming/public/mojom/demuxer_connector.mojom.h"
+#include "components/cast_streaming/public/mojom/renderer_controller.mojom.h"
 #include "mojo/public/cpp/bindings/associated_remote.h"
 
 namespace cast_streaming {
@@ -26,9 +27,11 @@ class ReceiverSessionClient {
 
   ReceiverSessionClient& operator=(const ReceiverSessionClient&) = delete;
 
-  void SetDemuxerConnector(
+  void SetMojoEndpoints(
       mojo::AssociatedRemote<cast_streaming::mojom::DemuxerConnector>
-          demuxer_connector);
+          demuxer_connector,
+      mojo::AssociatedRemote<cast_streaming::mojom::RendererController>
+          renderer_controller);
 
   bool HasReceiverSession();