MojoCompositorFrameSinkPrivate should support copy requests

content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.cc

Index: content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.cc
diff --git a/content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.cc b/content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.cc
index c4a16f2fadb5906a7521d1e0021a877ca08ca8ce..ac28594252a7e19cf6d1387fa9d0d6f5c4427a3a 100644
--- a/content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.cc
+++ b/content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.cc
@@ -89,4 +89,18 @@ void OffscreenCanvasCompositorFrameSink::OnClientConnectionLost() {
       support_.frame_sink_id());
 }
 
+void OffscreenCanvasCompositorFrameSink::RequestCopyOfSurface(
+    std::unique_ptr<cc::CopyOutputRequest> request,
+    const RequestCopyOfSurfaceCallback& callback) {
+  request->set_result_callback(callback);
+  support_.RequestCopyOfSurface(std::move(request));
+}
+
+void OffscreenCanvasCompositorFrameSink::DeleteMailbox(
+    const gpu::Mailbox& mailbox,
+    const ::gpu::SyncToken& sync_token,
+    bool is_lost) {
+  support_.DeleteMailbox(mailbox, sync_token, is_lost);
+}
+
 }  // namespace content