MojoCompositorFrameSinkPrivate should support copy requests

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 2ccac2927d027732dbea242f5eca835e27e92e72..487a604953526a8ba04d7bd9bdb45ec5fb04ace2 100644
--- a/components/display_compositor/gpu_compositor_frame_sink.h
+++ b/components/display_compositor/gpu_compositor_frame_sink.h
@@ -55,6 +55,12 @@ class DISPLAY_COMPOSITOR_EXPORT GpuCompositorFrameSink
   void AddChildFrameSink(const cc::FrameSinkId& child_frame_sink_id) override;
   void RemoveChildFrameSink(
       const cc::FrameSinkId& child_frame_sink_id) override;
+  void RequestCopyOfSurface(
+      std::unique_ptr<cc::CopyOutputRequest> request,
+      const RequestCopyOfSurfaceCallback& callback) override;
+  void ReleaseCopyOfSurface(const gpu::Mailbox& mailbox,
+                            const ::gpu::SyncToken& sync_token,
+                            bool is_lost) override;
 
  protected:
   void OnClientConnectionLost();