Add/remove surface references via MojoCompositorFrameSink.

content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.h

Index: content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.h
diff --git a/content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.h b/content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.h
index c8349e296ea6a73d65658dafe770c982f9335a6b..94714c5b9a8c998736c0862526563e8cc4dbae3e 100644
--- a/content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.h
+++ b/content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.h
@@ -28,6 +28,10 @@ class OffscreenCanvasCompositorFrameSink
   void SubmitCompositorFrame(const cc::LocalFrameId& local_frame_id,
                              cc::CompositorFrame frame) override;
   void SetNeedsBeginFrame(bool needs_begin_frame) override;
+  void AddSurfaceReferences(
+      const std::vector<cc::SurfaceReference>& references) override {}
+  void RemoveSurfaceReferences(
+      const std::vector<cc::SurfaceReference>& references) override {}
 
   // cc::SurfaceFactoryClient implementation.
   void ReturnResources(const cc::ReturnedResourceArray& resources) override;