WIP: move OffscreenCanvas into new display compositor

components/display_compositor/gpu_compositor_frame_sink.h

Index: components/display_compositor/gpu_compositor_frame_sink.h
diff --git a/components/display_compositor/gpu_compositor_frame_sink.h b/components/display_compositor/gpu_compositor_frame_sink.h
index 0b1acb9e3bf56a1891681ae8f9101f8040b14c20..286e47964c4de8360617275911747652b973c735 100644
--- a/components/display_compositor/gpu_compositor_frame_sink.h
+++ b/components/display_compositor/gpu_compositor_frame_sink.h
@@ -23,13 +23,11 @@ namespace display_compositor {
 // Server side representation of a WindowSurface.
 class DISPLAY_COMPOSITOR_EXPORT GpuCompositorFrameSink
     : public NON_EXPORTED_BASE(cc::CompositorFrameSinkSupportClient),
-      public NON_EXPORTED_BASE(cc::mojom::MojoCompositorFrameSink),
-      public NON_EXPORTED_BASE(cc::mojom::MojoCompositorFrameSinkPrivate) {
+      public NON_EXPORTED_BASE(cc::mojom::MojoCompositorFrameSink) {
  public:
   GpuCompositorFrameSink(
       GpuCompositorFrameSinkDelegate* delegate,
       std::unique_ptr<cc::CompositorFrameSinkSupport>,
-      cc::mojom::MojoCompositorFrameSinkPrivateRequest private_request,
       cc::mojom::MojoCompositorFrameSinkClientPtr client);
 
   ~GpuCompositorFrameSink() override;
@@ -43,14 +41,16 @@ class DISPLAY_COMPOSITOR_EXPORT GpuCompositorFrameSink
                const cc::SurfaceSequence& sequence) override;
   void Satisfy(const cc::SurfaceSequence& sequence) override;
 
-  // cc::mojom::MojoCompositorFrameSinkPrivate:
-  void AddChildFrameSink(const cc::FrameSinkId& child_frame_sink_id) override;
-  void RemoveChildFrameSink(
-      const cc::FrameSinkId& child_frame_sink_id) override;
-
  protected:
   void OnClientConnectionLost();
-  void OnPrivateConnectionLost();
+  void SetClientConnectionLost(bool client_connection_lost) {
+    client_connection_lost_ = client_connection_lost;
+  }
+  bool GetClientConnectionLost() { return client_connection_lost_; }
+  void SetPrivateConnectionLost(bool private_connection_lost) {
+    private_connection_lost_ = private_connection_lost;
+  }
+  bool GetPrivateConnectionLost() { return private_connection_lost_; }
 
   GpuCompositorFrameSinkDelegate* const delegate_;
   std::unique_ptr<cc::CompositorFrameSinkSupport> support_;
@@ -63,11 +63,9 @@ class DISPLAY_COMPOSITOR_EXPORT GpuCompositorFrameSink
   void WillDrawSurface() override;
 
   bool client_connection_lost_ = false;
-  bool private_connection_lost_ = false;
+  bool private_connection_lost_ = true;
 
   cc::mojom::MojoCompositorFrameSinkClientPtr client_;
-  mojo::Binding<cc::mojom::MojoCompositorFrameSinkPrivate>
-      compositor_frame_sink_private_binding_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuCompositorFrameSink);
 };