content: removes support for mash from content/browser

As we no longer intend to ship the mash, this code is no longer applicable.

BUG=958121
TEST=covered by tests

Change-Id: I890de497c7e77b4a86b96437e268022049ac4273
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1595077
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#656865}

content/browser/browser_plugin/browser_plugin_guest.cc

@@ -703,7 +703,7 @@ void BrowserPluginGuest::RenderViewReady() {
   // In case we've created a new guest render process after a crash, let the
   // associated BrowserPlugin know. We only need to send this if we're attached,
   // as guest_crashed_ is cleared automatically on attach anyways.
-  if (attached() && !features::IsMultiProcessMash()) {
+  if (attached()) {
     RenderWidgetHostViewGuest* rwhv = static_cast<RenderWidgetHostViewGuest*>(
         web_contents()->GetRenderWidgetHostView());
     if (rwhv) {

content/browser/compositor/gpu_process_transport_factory.cc

@@ -66,7 +66,6 @@
 #include "gpu/vulkan/buildflags.h"
 #include "services/ws/public/cpp/gpu/context_provider_command_buffer.h"
 #include "third_party/khronos/GLES2/gl2.h"
-#include "ui/base/ui_base_features.h"
 #include "ui/base/ui_base_switches_util.h"
 #include "ui/compositor/compositor.h"
 #include "ui/compositor/host/external_begin_frame_controller_client_impl.h"
@@ -218,13 +217,6 @@ GpuProcessTransportFactory::CreateSoftwareOutputDevice(
   if (command_line->HasSwitch(switches::kHeadless))
     return base::WrapUnique(new viz::SoftwareOutputDevice);
 
-#if defined(USE_AURA)
-  if (features::IsMultiProcessMash()) {
-    NOTREACHED();
-    return nullptr;
-  }
-#endif
-
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 #if defined(OS_WIN)
   return CreateSoftwareOutputDeviceWinBrowser(widget, software_backing_.get());

content/browser/frame_host/cross_process_frame_connector.cc

@@ -471,22 +471,6 @@ bool CrossProcessFrameConnector::IsHidden() const {
   return visibility_ == blink::mojom::FrameVisibility::kNotRendered;
 }
 
-#if defined(USE_AURA)
-void CrossProcessFrameConnector::EmbedRendererWindowTreeClientInParent(
-    ws::mojom::WindowTreeClientPtr window_tree_client) {
-  RenderWidgetHostViewBase* root = GetRootRenderWidgetHostView();
-  RenderWidgetHostViewBase* parent = GetParentRenderWidgetHostView();
-  if (!parent || !root)
-    return;
-  const int frame_routing_id = frame_proxy_in_parent_renderer_->GetRoutingID();
-  parent->EmbedChildFrameRendererWindowTreeClient(
-      root, frame_routing_id, std::move(window_tree_client));
-  frame_proxy_in_parent_renderer_->SetDestructionCallback(
-      base::BindOnce(&RenderWidgetHostViewBase::OnChildFrameDestroyed,
-                     parent->GetWeakPtr(), frame_routing_id));
-}
-#endif
-
 void CrossProcessFrameConnector::DidUpdateVisualProperties(
     const cc::RenderFrameMetadata& metadata) {
   frame_proxy_in_parent_renderer_->Send(new FrameMsg_DidUpdateVisualProperties(

content/browser/frame_host/cross_process_frame_connector.h

@@ -111,10 +111,6 @@ class CONTENT_EXPORT CrossProcessFrameConnector
   bool IsHidden() const override;
   bool IsThrottled() const override;
   bool IsSubtreeThrottled() const override;
-#if defined(USE_AURA)
-  void EmbedRendererWindowTreeClientInParent(
-      ws::mojom::WindowTreeClientPtr window_tree_client) override;
-#endif
   void DidUpdateVisualProperties(
       const cc::RenderFrameMetadata& metadata) override;
 

content/browser/gpu/browser_gpu_channel_host_factory.cc

@@ -37,7 +37,6 @@
 #include "gpu/ipc/common/gpu_client_ids.h"
 #include "gpu/ipc/in_process_command_buffer.h"
 #include "services/resource_coordinator/public/mojom/memory_instrumentation/constants.mojom.h"
-#include "ui/base/ui_base_features.h"
 
 #if defined(OS_MACOSX)
 #include "ui/accelerated_widget_mac/window_resize_helper_mac.h"
@@ -304,9 +303,6 @@ BrowserGpuChannelHostFactory::~BrowserGpuChannelHostFactory() {
 
 void BrowserGpuChannelHostFactory::EstablishGpuChannel(
     gpu::GpuChannelEstablishedCallback callback) {
-#if defined(USE_AURA)
-  DCHECK(!features::IsMultiProcessMash());
-#endif
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   if (gpu_channel_.get() && gpu_channel_->IsLost()) {
     DCHECK(!pending_request_.get());

content/browser/gpu/compositor_util.cc

@@ -35,7 +35,6 @@
 #include "gpu/config/gpu_switches.h"
 #include "gpu/ipc/host/gpu_memory_buffer_support.h"
 #include "media/media_buildflags.h"
-#include "ui/base/ui_base_features.h"
 #include "ui/gl/gl_switches.h"
 
 namespace content {
@@ -79,8 +78,6 @@ gpu::GpuFeatureStatus SafeGetFeatureStatus(
 gpu::GpuFeatureStatus GetGpuCompositingStatus(
     const gpu::GpuFeatureInfo& gpu_feature_info,
     GpuFeatureInfoType type) {
-  if (features::IsMultiProcessMash())
-    return gpu::kGpuFeatureStatusEnabled;
   gpu::GpuFeatureStatus status = SafeGetFeatureStatus(
       gpu_feature_info, gpu::GPU_FEATURE_TYPE_GPU_COMPOSITING);
 #if defined(USE_AURA) || defined(OS_MACOSX)

content/browser/gpu/gpu_process_host.cc

@@ -75,7 +75,6 @@
 #include "services/service_manager/public/cpp/interface_provider.h"
 #include "services/service_manager/sandbox/sandbox_type.h"
 #include "services/service_manager/sandbox/switches.h"
-#include "services/ws/public/mojom/constants.mojom.h"
 #include "ui/base/ui_base_features.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/display/display_switches.h"
@@ -463,14 +462,6 @@ void BindDiscardableMemoryRequestOnIO(
 void BindDiscardableMemoryRequestOnUI(
     discardable_memory::mojom::DiscardableSharedMemoryManagerRequest request) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
-
-#if defined(USE_AURA)
-  if (features::IsMultiProcessMash()) {
-    ServiceManagerConnection::GetForProcess()->GetConnector()->BindInterface(
-        ws::mojom::kServiceName, std::move(request));
-    return;
-  }
-#endif
   base::PostTaskWithTraits(
       FROM_HERE, {BrowserThread::IO},
       base::BindOnce(

content/browser/oop_browsertest.cc

@@ -22,7 +22,6 @@
 #include "gpu/config/gpu_switches.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkColor.h"
-#include "ui/base/ui_base_features.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/compositor/compositor_switches.h"
 #include "ui/gl/gl_switches.h"
@@ -37,10 +36,7 @@ class OOPBrowserTest : public ContentBrowserTest {
     command_line->AppendSwitch(switches::kEnableGpuRasterization);
     command_line->AppendSwitch(switches::kEnablePixelOutputInTests);
     command_line->AppendSwitch(switches::kEnableOopRasterization);
-
-    const bool use_gpu_in_tests = !features::IsMultiProcessMash();
-    if (use_gpu_in_tests)
-      command_line->AppendSwitch(switches::kUseGpuInTests);
+    command_line->AppendSwitch(switches::kUseGpuInTests);
   }
 
   void VerifyVisualStateUpdated(const base::Closure& done_cb,

content/browser/renderer_host/frame_connector_delegate.cc

@@ -38,9 +38,6 @@ void FrameConnectorDelegate::SynchronizeVisualProperties(
 
   if (!view_)
     return;
-#if defined(USE_AURA)
-  view_->SetFrameSinkId(frame_sink_id);
-#endif  // defined(USE_AURA)
 
   RenderWidgetHostImpl* render_widget_host = view_->host();
   DCHECK(render_widget_host);

content/browser/renderer_host/render_process_host_impl.cc

@@ -216,7 +216,6 @@
 #include "third_party/blink/public/public_buildflags.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/accessibility/accessibility_switches.h"
-#include "ui/base/ui_base_features.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/base/ui_base_switches_util.h"
 #include "ui/display/display_switches.h"
@@ -1545,14 +1544,12 @@ RenderProcessHostImpl::RenderProcessHostImpl(
 
   InitializeChannelProxy();
 
-  if (!features::IsMultiProcessMash()) {
-    const int id = GetID();
-    const uint64_t tracing_id =
-        ChildProcessHostImpl::ChildProcessUniqueIdToTracingProcessId(id);
-    gpu_client_.reset(new viz::GpuClient(
-        std::make_unique<BrowserGpuClientDelegate>(), id, tracing_id,
-        base::CreateSingleThreadTaskRunnerWithTraits({BrowserThread::IO})));
-  }
+  const int id = GetID();
+  const uint64_t tracing_id =
+      ChildProcessHostImpl::ChildProcessUniqueIdToTracingProcessId(id);
+  gpu_client_.reset(new viz::GpuClient(
+      std::make_unique<BrowserGpuClientDelegate>(), id, tracing_id,
+      base::CreateSingleThreadTaskRunnerWithTraits({BrowserThread::IO})));
 }
 
 // static

content/browser/renderer_host/render_widget_host_input_event_router_unittest.cc

@@ -25,7 +25,6 @@
 #include "content/test/test_render_view_host.h"
 #include "services/viz/public/interfaces/hit_test/input_target_client.mojom.h"
 #include "testing/gtest/include/gtest/gtest.h"
-#include "ui/base/ui_base_features.h"
 
 namespace content {
 
@@ -266,11 +265,8 @@ class RenderWidgetHostInputEventRouterTest : public testing::Test {
         child.view.get(), parent_view, view_root_.get(),
         false /* use_zoom_for_device_scale_factor */);
 
-    // This check often fails in Mash. https://crbug.com/933876
-    if (!features::IsMultiProcessMash()) {
-      EXPECT_EQ(child.view.get(), rwhier()->FindViewFromFrameSinkId(
-                                      child.view->GetFrameSinkId()));
-    }
+    EXPECT_EQ(child.view.get(),
+              rwhier()->FindViewFromFrameSinkId(child.view->GetFrameSinkId()));
 
     return child;
   }

content/browser/renderer_host/render_widget_host_view_aura.cc

@@ -23,7 +23,6 @@
 #include "components/viz/common/frame_sinks/copy_output_request.h"
 #include "components/viz/common/frame_sinks/copy_output_result.h"
 #include "components/viz/common/surfaces/local_surface_id_allocation.h"
-#include "components/viz/host/host_frame_sink_manager.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/accessibility/browser_accessibility_state_impl.h"
 #include "content/browser/bad_message.h"
@@ -47,7 +46,6 @@
 #include "content/browser/renderer_host/render_widget_host_view_event_handler.h"
 #include "content/browser/renderer_host/ui_events_helper.h"
 #include "content/common/input_messages.h"
-#include "content/common/render_widget_window_tree_client_factory.mojom.h"
 #include "content/common/text_input_state.h"
 #include "content/common/view_messages.h"
 #include "content/public/browser/content_browser_client.h"
@@ -56,8 +54,6 @@
 #include "content/public/common/use_zoom_for_dsf_policy.h"
 #include "gpu/ipc/common/gpu_messages.h"
 #include "services/service_manager/public/cpp/interface_provider.h"
-#include "services/ws/common/switches.h"
-#include "services/ws/public/mojom/window_tree_constants.mojom.h"
 #include "third_party/blink/public/platform/web_input_event.h"
 #include "third_party/blink/public/web/web_ime_text_span.h"
 #include "ui/accessibility/accessibility_switches.h"
@@ -71,7 +67,6 @@
 #include "ui/aura/client/transient_window_client.h"
 #include "ui/aura/client/window_parenting_client.h"
 #include "ui/aura/env.h"
-#include "ui/aura/mus/window_port_mus.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/aura/window_observer.h"
@@ -79,7 +74,6 @@
 #include "ui/base/clipboard/scoped_clipboard_writer.h"
 #include "ui/base/hit_test.h"
 #include "ui/base/ime/input_method.h"
-#include "ui/base/ui_base_features.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/base/ui_base_switches_util.h"
 #include "ui/base/ui_base_types.h"
@@ -145,16 +139,6 @@ using blink::WebTouchEvent;
 
 namespace content {
 
-namespace {
-
-// Callback from embedding the renderer.
-void EmbedCallback(bool result) {
-  if (!result)
-    DVLOG(1) << "embed failed";
-}
-
-}  // namespace
-
 #if defined(OS_WIN)
 
 // This class implements the ui::InputMethodKeyboardControllerObserver interface
@@ -369,11 +353,8 @@ RenderWidgetHostViewAura::RenderWidgetHostViewAura(
       is_guest_view_hack_(is_guest_view_hack),
       device_scale_factor_(0.0f),
       event_handler_(new RenderWidgetHostViewEventHandler(host(), this, this)),
-      frame_sink_id_(features::IsMultiProcessMash()
-                         ? viz::FrameSinkId()
-                         : is_guest_view_hack_
-                               ? AllocateFrameSinkIdForGuestViewHack()
-                               : host()->GetFrameSinkId()),
+      frame_sink_id_(is_guest_view_hack_ ? AllocateFrameSinkIdForGuestViewHack()
+                                         : host()->GetFrameSinkId()),
       weak_ptr_factory_(this) {
   if (!is_mus_browser_plugin_guest_)
     CreateDelegatedFrameHostClient();
@@ -956,20 +937,6 @@ void RenderWidgetHostViewAura::TransformPointToRootSurface(gfx::PointF* point) {
   aura::Window* root = window_->GetRootWindow();
   aura::Window::ConvertPointToTarget(window_, root, point);
   root->GetRootWindow()->transform().TransformPoint(point);
-
-// On ChromeOS, the root surface is the whole desktop. When using the
-// window-service converting to screen coordinates gives us that.
-#if defined(OS_CHROMEOS)
-  if (features::IsUsingWindowService()) {
-    aura::client::ScreenPositionClient* screen_client =
-        aura::client::GetScreenPositionClient(root);
-    if (screen_client) {
-      gfx::Point rounded_point(point->x(), point->y());
-      screen_client->ConvertPointToScreen(root, &rounded_point);
-      *point = gfx::PointF(rounded_point);
-    }
-  }
-#endif
 }
 
 gfx::Rect RenderWidgetHostViewAura::GetBoundsInRootWindow() {
@@ -1822,14 +1789,6 @@ viz::FrameSinkId RenderWidgetHostViewAura::GetRootFrameSinkId() {
   if (!window_ || !window_->GetHost() || !window_->GetHost()->compositor())
     return viz::FrameSinkId();
 
-  // In single-process mash the root is provided by Ash. Have
-  // HostFrameSinkManager walk the tree to find the right root.
-  if (features::IsSingleProcessMash()) {
-    base::Optional<viz::FrameSinkId> root =
-        GetHostFrameSinkManager()->FindRootFrameSinkId(frame_sink_id_);
-    return root ? *root : viz::FrameSinkId();
-  }
-
   return window_->GetHost()->compositor()->frame_sink_id();
 }
 
@@ -1871,14 +1830,6 @@ void RenderWidgetHostViewAura::FocusedNodeChanged(
 #endif
 }
 
-void RenderWidgetHostViewAura::ScheduleEmbed(
-    ws::mojom::WindowTreeClientPtr client,
-    base::OnceCallback<void(const base::UnguessableToken&)> callback) {
-  DCHECK(features::IsMultiProcessMash());
-  aura::Env::GetInstance()->ScheduleEmbed(std::move(client),
-                                          std::move(callback));
-}
-
 void RenderWidgetHostViewAura::OnScrollEvent(ui::ScrollEvent* event) {
   event_handler_->OnScrollEvent(event);
 }
@@ -2108,18 +2059,6 @@ void RenderWidgetHostViewAura::CreateAuraWindow(aura::client::WindowType type) {
   // Init(), because it needs to have the layer.
   if (frame_sink_id_.is_valid())
     window_->SetEmbedFrameSinkId(frame_sink_id_);
-
-  if (!features::IsMultiProcessMash())
-    return;
-
-  // Embed the renderer into the Window.
-  // Use kEmbedFlagEmbedderControlsVisibility so that the renderer can't change
-  // the visibility of |window_|.
-  aura::WindowPortMus::Get(window_)->Embed(
-      GetWindowTreeClientFromRenderer(),
-      ws::mojom::kEmbedFlagEmbedderInterceptsEvents |
-          ws::mojom::kEmbedFlagEmbedderControlsVisibility,
-      base::BindOnce(&EmbedCallback));
 }
 
 void RenderWidgetHostViewAura::CreateDelegatedFrameHostClient() {

content/browser/renderer_host/render_widget_host_view_aura.h

@@ -194,12 +194,8 @@ class CONTENT_EXPORT RenderWidgetHostViewAura
       gfx::PointF* transformed_point) override;
   viz::FrameSinkId GetRootFrameSinkId() override;
   viz::SurfaceId GetCurrentSurfaceId() const override;
-
   void FocusedNodeChanged(bool is_editable_node,
                           const gfx::Rect& node_bounds_in_screen) override;
-  void ScheduleEmbed(ws::mojom::WindowTreeClientPtr client,
-                     base::OnceCallback<void(const base::UnguessableToken&)>
-                         callback) override;
   void OnSynchronizedDisplayPropertiesChanged() override;
   viz::ScopedSurfaceIdAllocator DidUpdateVisualProperties(
       const cc::RenderFrameMetadata& metadata) override;

content/browser/renderer_host/render_widget_host_view_base.cc

@@ -41,11 +41,6 @@
 #include "ui/gfx/geometry/size_conversions.h"
 #include "ui/gfx/geometry/size_f.h"
 
-#if defined(USE_AURA)
-#include "base/unguessable_token.h"
-#include "content/common/render_widget_window_tree_client_factory.mojom.h"
-#endif
-
 namespace content {
 
 RenderWidgetHostViewBase::RenderWidgetHostViewBase(RenderWidgetHost* host)
@@ -840,74 +835,11 @@ base::TimeTicks RenderWidgetHostViewBase::GetAndResetLastTabChangeStartTime() {
   return stored_time;
 }
 
-#if defined(USE_AURA)
-void RenderWidgetHostViewBase::EmbedChildFrameRendererWindowTreeClient(
-    RenderWidgetHostViewBase* root_view,
-    int routing_id,
-    ws::mojom::WindowTreeClientPtr renderer_window_tree_client) {
-  RenderWidgetHost* render_widget_host = GetRenderWidgetHost();
-  if (!render_widget_host)
-    return;
-  const int embed_id = ++next_embed_id_;
-  pending_embeds_[routing_id] = embed_id;
-  root_view->ScheduleEmbed(
-      std::move(renderer_window_tree_client),
-      base::BindOnce(&RenderWidgetHostViewBase::OnDidScheduleEmbed,
-                     GetWeakPtr(), routing_id, embed_id));
-}
-
-void RenderWidgetHostViewBase::OnChildFrameDestroyed(int routing_id) {
-  pending_embeds_.erase(routing_id);
-  // Tests may not create |render_widget_window_tree_client_| (tests don't
-  // necessarily create RenderWidgetHostViewAura).
-  if (render_widget_window_tree_client_)
-    render_widget_window_tree_client_->DestroyFrame(routing_id);
-}
-#endif
-
 void RenderWidgetHostViewBase::SynchronizeVisualProperties() {
   if (host())
     host()->SynchronizeVisualProperties();
 }
 
-#if defined(USE_AURA)
-void RenderWidgetHostViewBase::OnDidScheduleEmbed(
-    int routing_id,
-    int embed_id,
-    const base::UnguessableToken& token) {
-  auto iter = pending_embeds_.find(routing_id);
-  if (iter == pending_embeds_.end() || iter->second != embed_id)
-    return;
-  pending_embeds_.erase(iter);
-  // Tests may not create |render_widget_window_tree_client_| (tests don't
-  // necessarily create RenderWidgetHostViewAura).
-  if (render_widget_window_tree_client_)
-    render_widget_window_tree_client_->Embed(routing_id, token);
-}
-
-void RenderWidgetHostViewBase::ScheduleEmbed(
-    ws::mojom::WindowTreeClientPtr client,
-    base::OnceCallback<void(const base::UnguessableToken&)> callback) {
-  NOTREACHED();
-}
-
-ws::mojom::WindowTreeClientPtr
-RenderWidgetHostViewBase::GetWindowTreeClientFromRenderer() {
-  // NOTE: this function may be called multiple times.
-  RenderWidgetHost* render_widget_host = GetRenderWidgetHost();
-  mojom::RenderWidgetWindowTreeClientFactoryPtr factory;
-  BindInterface(render_widget_host->GetProcess(), &factory);
-
-  ws::mojom::WindowTreeClientPtr window_tree_client;
-  factory->CreateWindowTreeClientForRenderWidget(
-      render_widget_host->GetRoutingID(),
-      mojo::MakeRequest(&window_tree_client),
-      mojo::MakeRequest(&render_widget_window_tree_client_));
-  return window_tree_client;
-}
-
-#endif
-
 void RenderWidgetHostViewBase::DidNavigate() {
   if (host())
     host()->SynchronizeVisualProperties();

content/browser/renderer_host/render_widget_host_view_base.h

@@ -44,18 +44,8 @@
 #include "ui/gfx/range/range.h"
 #include "ui/surface/transport_dib.h"
 
-#if defined(USE_AURA)
-#include "base/containers/flat_map.h"
-#include "content/common/render_widget_window_tree_client_factory.mojom.h"
-#include "services/ws/public/mojom/window_tree.mojom.h"
-#endif
-
 struct WidgetHostMsg_SelectionBounds_Params;
 
-namespace base {
-class UnguessableToken;
-}
-
 namespace cc {
 struct BeginFrameAck;
 }  // namespace cc
@@ -582,14 +572,6 @@ class CONTENT_EXPORT RenderWidgetHostViewBase
     return is_currently_scrolling_viewport_;
   }
 
-#if defined(USE_AURA)
-  void EmbedChildFrameRendererWindowTreeClient(
-      RenderWidgetHostViewBase* root_view,
-      int routing_id,
-      ws::mojom::WindowTreeClientPtr renderer_window_tree_client);
-  void OnChildFrameDestroyed(int routing_id);
-#endif
-
   virtual void DidNavigate();
 
   // Called when the RenderWidgetHostImpl has be initialized.
@@ -620,14 +602,6 @@ class CONTENT_EXPORT RenderWidgetHostViewBase
   virtual void StopFlingingIfNecessary(const blink::WebGestureEvent& event,
                                        InputEventAckState ack_result);
 
-#if defined(USE_AURA)
-  virtual void ScheduleEmbed(
-      ws::mojom::WindowTreeClientPtr client,
-      base::OnceCallback<void(const base::UnguessableToken&)> callback);
-
-  ws::mojom::WindowTreeClientPtr GetWindowTreeClientFromRenderer();
-#endif
-
   // If |event| is a touchpad pinch or double tap event for which we've sent a
   // synthetic wheel event, forward the |event| to the renderer, subject to
   // |ack_result| which is the ACK result of the synthetic wheel.
@@ -694,12 +668,6 @@ class CONTENT_EXPORT RenderWidgetHostViewBase
 
   void SynchronizeVisualProperties();
 
-#if defined(USE_AURA)
-  void OnDidScheduleEmbed(int routing_id,
-                          int embed_id,
-                          const base::UnguessableToken& token);
-#endif
-
   // Called when display properties that need to be synchronized with the
   // renderer process changes. This method is called before notifying
   // RenderWidgetHostImpl in order to allow the view to allocate a new
@@ -731,18 +699,6 @@ class CONTENT_EXPORT RenderWidgetHostViewBase
 
   base::ObserverList<RenderWidgetHostViewBaseObserver>::Unchecked observers_;
 
-#if defined(USE_AURA)
-  mojom::RenderWidgetWindowTreeClientPtr render_widget_window_tree_client_;
-
-  int next_embed_id_ = 0;
-  // Maps from routing_id to embed-id. The |routing_id| is the id supplied to
-  // EmbedChildFrameRendererWindowTreeClient() and the embed-id a unique id
-  // generate at the time EmbedChildFrameRendererWindowTreeClient() was called.
-  // This is done to ensure when OnDidScheduleEmbed() is received another call
-  // too EmbedChildFrameRendererWindowTreeClient() did not come in.
-  base::flat_map<int, int> pending_embeds_;
-#endif
-
   base::Optional<blink::WebGestureEvent> pending_touchpad_pinch_begin_;
 
   // The last tab switch processing start time. This should only be set and

content/browser/renderer_host/render_widget_host_view_child_frame.cc

@@ -43,17 +43,11 @@
 #include "content/public/browser/render_process_host.h"
 #include "gpu/ipc/common/gpu_messages.h"
 #include "third_party/blink/public/platform/web_touch_event.h"
-#include "ui/base/ui_base_features.h"
 #include "ui/gfx/geometry/dip_util.h"
 #include "ui/gfx/geometry/size_conversions.h"
 #include "ui/gfx/geometry/size_f.h"
 #include "ui/touch_selection/touch_selection_controller.h"
 
-#if defined(USE_AURA)
-#include "services/ws/public/mojom/window_tree.mojom.h"
-#include "ui/aura/env.h"
-#endif
-
 namespace content {
 
 // static
@@ -76,20 +70,14 @@ RenderWidgetHostViewChildFrame::RenderWidgetHostViewChildFrame(
       enable_surface_synchronization_(
           features::IsSurfaceSynchronizationEnabled()),
       weak_factory_(this) {
-  if (features::IsMultiProcessMash()) {
-    // In Mus the RenderFrameProxy will eventually assign a viz::FrameSinkId
-    // until then set ours invalid, as operations using it will be disregarded.
-    frame_sink_id_ = viz::FrameSinkId();
-  } else {
-    GetHostFrameSinkManager()->RegisterFrameSinkId(
-        frame_sink_id_, this,
-        enable_surface_synchronization_
-            ? viz::ReportFirstSurfaceActivation::kNo
-            : viz::ReportFirstSurfaceActivation::kYes);
-    GetHostFrameSinkManager()->SetFrameSinkDebugLabel(
-        frame_sink_id_, "RenderWidgetHostViewChildFrame");
-    CreateCompositorFrameSinkSupport();
-  }
+  GetHostFrameSinkManager()->RegisterFrameSinkId(
+      frame_sink_id_, this,
+      enable_surface_synchronization_
+          ? viz::ReportFirstSurfaceActivation::kNo
+          : viz::ReportFirstSurfaceActivation::kYes);
+  GetHostFrameSinkManager()->SetFrameSinkDebugLabel(
+      frame_sink_id_, "RenderWidgetHostViewChildFrame");
+  CreateCompositorFrameSinkSupport();
 }
 
 RenderWidgetHostViewChildFrame::~RenderWidgetHostViewChildFrame() {
@@ -99,11 +87,9 @@ RenderWidgetHostViewChildFrame::~RenderWidgetHostViewChildFrame() {
   if (frame_connector_)
     DetachFromTouchSelectionClientManagerIfNecessary();
 
-  if (!features::IsMultiProcessMash()) {
-    ResetCompositorFrameSinkSupport();
-    if (GetHostFrameSinkManager())
-      GetHostFrameSinkManager()->InvalidateFrameSinkId(frame_sink_id_);
-  }
+  ResetCompositorFrameSinkSupport();
+  if (GetHostFrameSinkManager())
+    GetHostFrameSinkManager()->InvalidateFrameSinkId(frame_sink_id_);
 }
 
 void RenderWidgetHostViewChildFrame::Init() {
@@ -152,8 +138,7 @@ void RenderWidgetHostViewChildFrame::SetFrameConnectorDelegate(
       frame_connector_->GetParentRenderWidgetHostView();
 
   if (parent_view) {
-    DCHECK(parent_view->GetFrameSinkId().is_valid() ||
-           features::IsMultiProcessMash());
+    DCHECK(parent_view->GetFrameSinkId().is_valid());
     SetParentFrameSinkId(parent_view->GetFrameSinkId());
   }
 
@@ -173,24 +158,9 @@ void RenderWidgetHostViewChildFrame::SetFrameConnectorDelegate(
     }
   }
 
-#if defined(USE_AURA)
-  if (features::IsMultiProcessMash()) {
-    frame_connector_->EmbedRendererWindowTreeClientInParent(
-        GetWindowTreeClientFromRenderer());
-  }
-#endif
-
   SendSurfaceInfoToEmbedder();
 }
 
-#if defined(USE_AURA)
-void RenderWidgetHostViewChildFrame::SetFrameSinkId(
-    const viz::FrameSinkId& frame_sink_id) {
-  if (features::IsMultiProcessMash())
-    frame_sink_id_ = frame_sink_id;
-}
-#endif  // defined(USE_AURA)
-
 void RenderWidgetHostViewChildFrame::UpdateIntrinsicSizingInfo(
     const blink::WebIntrinsicSizingInfo& sizing_info) {
   if (frame_connector_)
@@ -601,8 +571,7 @@ void RenderWidgetHostViewChildFrame::DidCreateNewRendererCompositorFrameSink(
 
 void RenderWidgetHostViewChildFrame::SetParentFrameSinkId(
     const viz::FrameSinkId& parent_frame_sink_id) {
-  if (parent_frame_sink_id_ == parent_frame_sink_id ||
-      features::IsMultiProcessMash())
+  if (parent_frame_sink_id_ == parent_frame_sink_id)
     return;
 
   auto* host_frame_sink_manager = GetHostFrameSinkManager();
@@ -623,8 +592,6 @@ void RenderWidgetHostViewChildFrame::SetParentFrameSinkId(
 }
 
 void RenderWidgetHostViewChildFrame::SendSurfaceInfoToEmbedder() {
-  if (features::IsMultiProcessMash())
-    return;
   if (enable_surface_synchronization_)
     return;
   if (!last_activated_surface_info_.is_valid())
@@ -1065,7 +1032,7 @@ RenderWidgetHostViewChildFrame::DidUpdateVisualProperties(
 }
 
 void RenderWidgetHostViewChildFrame::CreateCompositorFrameSinkSupport() {
-  if (features::IsMultiProcessMash() || enable_viz_)
+  if (enable_viz_)
     return;
 
   DCHECK(!support_);

content/browser/renderer_host/render_widget_host_view_child_frame.h

@@ -63,12 +63,6 @@ class CONTENT_EXPORT RenderWidgetHostViewChildFrame
 
   void SetFrameConnectorDelegate(FrameConnectorDelegate* frame_connector);
 
-#if defined(USE_AURA)
-  // When the viz::FrameSinkId for this child frame is created and registered
-  // remotely, it can be set here.
-  void SetFrameSinkId(const viz::FrameSinkId& frame_sink_id);
-#endif  // defined(USE_AURA)
-
   // This functions registers single-use callbacks that want to be notified when
   // the next frame is swapped. The callback is triggered by
   // SubmitCompositorFrame, which is the appropriate time to request pixel

content/common/BUILD.gn

@@ -487,7 +487,6 @@ mojom("mojo_bindings") {
     "render_frame_message_filter.mojom",
     "render_frame_metadata.mojom",
     "render_message_filter.mojom",
-    "render_widget_window_tree_client_factory.mojom",
     "renderer.mojom",
     "renderer_host.mojom",
     "widget.mojom",

content/common/render_widget_window_tree_client_factory.mojom

@@ -1,27 +0,0 @@
-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-module content.mojom;
-
-import "mojo/public/mojom/base/unguessable_token.mojom";
-import "services/ws/public/mojom/window_tree.mojom";
-
-interface RenderWidgetWindowTreeClient {
-  // Asks the renderer to create a Window for the frame with the routing id
-  // |routing_id| and embeds the WindowTreeClient that was previously supplied
-  // to ScheduleEmbed().
-  Embed(uint32 frame_routing_id, mojo_base.mojom.UnguessableToken token);
-
-  // Called when a render frame has been destroyed. This is sent via mojom
-  // to handle to ensure there aren't race conditions because of message order
-  // delivery.
-  DestroyFrame(uint32 frame_routing_id);
-};
-
-interface RenderWidgetWindowTreeClientFactory {
-  CreateWindowTreeClientForRenderWidget(
-      uint32 render_widget_host_routing_id,
-      ws.mojom.WindowTreeClient& window_tree_client,
-      RenderWidgetWindowTreeClient& render_widget_window_tree_client_request);
-};

content/test/test_render_view_host.h

@@ -135,11 +135,6 @@ class TestRenderWidgetHostView : public RenderWidgetHostViewBase,
   void reset_did_change_compositor_frame_sink() {
     did_change_compositor_frame_sink_ = false;
   }
-#if defined(USE_AURA)
-  void ScheduleEmbed(ws::mojom::WindowTreeClientPtr client,
-                     base::OnceCallback<void(const base::UnguessableToken&)>
-                         callback) override {}
-#endif
   // viz::HostFrameSinkClient implementation.
   void OnFirstSurfaceActivation(const viz::SurfaceInfo& surface_info) override;
   void OnFrameTokenChanged(uint32_t frame_token) override;