Implement WebGL's commit on the main thread

content/browser/renderer_host/offscreen_canvas_frame_receiver_impl.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_FRAME_RECEIVER_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_FRAME_RECEIVER_IMPL_H_
 
 #include "cc/surfaces/surface_factory.h"
 #include "cc/surfaces/surface_factory_client.h"
 #include "third_party/WebKit/public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom.h"
 
 namespace content {
 
 class OffscreenCanvasFrameReceiverImpl
     : public blink::mojom::OffscreenCanvasFrameReceiver,
       public cc::SurfaceFactoryClient {
  public:
   OffscreenCanvasFrameReceiverImpl();
   ~OffscreenCanvasFrameReceiverImpl() override;
 
   static void Create(blink::mojom::OffscreenCanvasFrameReceiverRequest request);
 
+  void SetClient(
+      blink::mojom::OffscreenCanvasFrameReceiverClientPtr client) override;
   void SubmitCompositorFrame(const cc::SurfaceId& surface_id,
                              cc::CompositorFrame frame) override;
 
   // cc::SurfaceFactoryClient implementation.
   void ReturnResources(const cc::ReturnedResourceArray& resources) override;
   void WillDrawSurface(const cc::SurfaceId& id,
                        const gfx::Rect& damage_rect) override;
   void SetBeginFrameSource(cc::BeginFrameSource* begin_frame_source) override;
 
  private:
   cc::SurfaceId surface_id_;
   std::unique_ptr<cc::SurfaceFactory> surface_factory_;
+  blink::mojom::OffscreenCanvasFrameReceiverClientPtr client_;
 
   DISALLOW_COPY_AND_ASSIGN(OffscreenCanvasFrameReceiverImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_FRAME_RECEIVER_IMPL_H_