Convert offscreen canvas to use FrameSinkManagerHost.

content/browser/renderer_host/offscreen_canvas_surface_impl.h

Index: content/browser/renderer_host/offscreen_canvas_surface_impl.h
diff --git a/content/browser/renderer_host/offscreen_canvas_surface_impl.h b/content/browser/renderer_host/offscreen_canvas_surface_impl.h
index 7757e57bc61169c479390da4460244e33b4820bf..057649a3e733b92bb5633f5b208259a09f3528a8 100644
--- a/content/browser/renderer_host/offscreen_canvas_surface_impl.h
+++ b/content/browser/renderer_host/offscreen_canvas_surface_impl.h
@@ -26,6 +26,10 @@ class CONTENT_EXPORT OffscreenCanvasSurfaceImpl
                      cc::mojom::DisplayCompositorClientPtr client,
                      blink::mojom::OffscreenCanvasSurfaceRequest request);
 
+  void CreateCompositorFrameSink(
+      cc::mojom::MojoCompositorFrameSinkClientPtr client,
+      cc::mojom::MojoCompositorFrameSinkRequest request);
+
   void OnSurfaceCreated(const cc::SurfaceInfo& surface_info);
 
   // blink::mojom::OffscreenCanvasSurface implementation.
@@ -47,11 +51,15 @@ class CONTENT_EXPORT OffscreenCanvasSurfaceImpl
   cc::mojom::DisplayCompositorClientPtr client_;
   mojo::StrongBindingPtr<blink::mojom::OffscreenCanvasSurface> binding_;
 
+  cc::mojom::MojoCompositorFrameSinkPrivatePtr compositor_frame_sink_private_;
+
   // Surface-related state
   const cc::FrameSinkId frame_sink_id_;
   cc::LocalSurfaceId current_local_surface_id_;
   const cc::FrameSinkId parent_frame_sink_id_;
 
+  bool has_registered_frame_sink_hierarchy_ = false;
+
   DISALLOW_COPY_AND_ASSIGN(OffscreenCanvasSurfaceImpl);
 };