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..7fdf3bd77e198d75d902f869171ffe507574ddcc 100644
--- a/components/display_compositor/gpu_compositor_frame_sink.h
+++ b/components/display_compositor/gpu_compositor_frame_sink.h
@@ -50,6 +50,12 @@ class DISPLAY_COMPOSITOR_EXPORT GpuCompositorFrameSink
   void Require(const cc::LocalSurfaceId& local_surface_id,
                const cc::SurfaceSequence& sequence) override;
   void Satisfy(const cc::SurfaceSequence& sequence) override;
+  void RequestCopyOfSurface(
+      std::unique_ptr<cc::CopyOutputRequest> request,
+      const RequestCopyOfSurfaceCallback& callback) override;
+  void DeleteMailbox(const gpu::Mailbox& mailbox,
+                     const ::gpu::SyncToken& sync_token,
+                     bool is_lost) override;
 
   // cc::mojom::MojoCompositorFrameSinkPrivate:
   void AddChildFrameSink(const cc::FrameSinkId& child_frame_sink_id) override;