MojoCompositorFrameSinkPrivate should support copy requests

components/exo/compositor_frame_sink.cc

Index: components/exo/compositor_frame_sink.cc
diff --git a/components/exo/compositor_frame_sink.cc b/components/exo/compositor_frame_sink.cc
index 59a3ea4acb67a0ea7ba671f23b5f48a68ea7425a..4ce128a28f40f2726d4dccab567f43b9a8c5ff03 100644
--- a/components/exo/compositor_frame_sink.cc
+++ b/components/exo/compositor_frame_sink.cc
@@ -49,6 +49,19 @@ void CompositorFrameSink::Satisfy(const cc::SurfaceSequence& sequence) {
   support_.Satisfy(sequence);
 }
 
+void CompositorFrameSink::RequestCopyOfSurface(
+    std::unique_ptr<cc::CopyOutputRequest> request,
+    const RequestCopyOfSurfaceCallback& callback) {
+  request->set_result_callback(callback);
+  support_.RequestCopyOfSurface(std::move(request));
+}
+
+void CompositorFrameSink::DeleteMailbox(const gpu::Mailbox& mailbox,
+                                        const ::gpu::SyncToken& sync_token,
+                                        bool is_lost) {
+  support_.DeleteMailbox(mailbox, sync_token, is_lost);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // cc::CompositorFrameSinkSupportClient overrides: