MojoCompositorFrameSinkPrivate should support copy requests

components/display_compositor/gpu_compositor_frame_sink.cc

Index: components/display_compositor/gpu_compositor_frame_sink.cc
diff --git a/components/display_compositor/gpu_compositor_frame_sink.cc b/components/display_compositor/gpu_compositor_frame_sink.cc
index 9a6347f146602e13ddc0e7a36ba5759fb34f825f..9ee9d01b72a29c5678e709d3cd4f230f91dafe65 100644
--- a/components/display_compositor/gpu_compositor_frame_sink.cc
+++ b/components/display_compositor/gpu_compositor_frame_sink.cc
@@ -150,4 +150,17 @@ void GpuCompositorFrameSink::OnPrivateConnectionLost() {
                                      client_connection_lost_);
 }
 
+void GpuCompositorFrameSink::RequestCopyOfSurface(
+    std::unique_ptr<cc::CopyOutputRequest> request,
+    const RequestCopyOfSurfaceCallback& callback) {
+  request->set_result_callback(callback);
+  support_.RequestCopyOfSurface(std::move(request));
+}
+
+void GpuCompositorFrameSink::DeleteMailbox(const gpu::Mailbox& mailbox,
+                                           const ::gpu::SyncToken& sync_token,
+                                           bool is_lost) {
+  support_.DeleteMailbox(mailbox, sync_token, is_lost);
+}
+
 }  // namespace display_compositor