Make OffscreenCanvas animation in sync with its placeholder canvas's parent frame rate

content/browser/renderer_host/offscreen_canvas_surface_factory_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_SURFACE_FACTORY_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_SURFACE_FACTORY_IMPL_H_
 
 #include "third_party/WebKit/public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom.h"
 
 namespace content {
 
 class OffscreenCanvasSurfaceFactoryImpl
     : public blink::mojom::OffscreenCanvasSurfaceFactory {
  public:
   OffscreenCanvasSurfaceFactoryImpl() {}
   ~OffscreenCanvasSurfaceFactoryImpl() override {}
 
   static void Create(
       blink::mojom::OffscreenCanvasSurfaceFactoryRequest request);
 
   // blink::mojom::OffscreenCanvasSurfaceFactory implementation.
   void CreateOffscreenCanvasSurface(
+      const cc::FrameSinkId& parent_frame_sink_id,
       const cc::FrameSinkId& frame_sink_id,
       blink::mojom::OffscreenCanvasSurfaceClientPtr client,
       blink::mojom::OffscreenCanvasSurfaceRequest request) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(OffscreenCanvasSurfaceFactoryImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_SURFACE_FACTORY_IMPL_H_