Create manager to track OffscreenCanvasSurfaceImpl instances

content/browser/renderer_host/offscreen_canvas_compositor_frame_sink_provider_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_COMPOSITOR_FRAME_SINK_PROVIDER_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_COMPOSITOR_FRAME_SINK_PROVIDER_IMPL_H_
 
 #include "third_party/WebKit/public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom.h"
 
 namespace content {
 
 class OffscreenCanvasCompositorFrameSinkProviderImpl
     : public blink::mojom::OffscreenCanvasCompositorFrameSinkProvider {
  public:
   OffscreenCanvasCompositorFrameSinkProviderImpl();
   ~OffscreenCanvasCompositorFrameSinkProviderImpl() override;
 
   static void Create(
       blink::mojom::OffscreenCanvasCompositorFrameSinkProviderRequest request);
 
   // blink::mojom::OffscreenCanvasCompositorFrameSinkProvider implementation.
   void CreateCompositorFrameSink(
+      uint32_t canvas_id,
       const cc::SurfaceId& surface_id,
       cc::mojom::MojoCompositorFrameSinkClientPtr client,
       cc::mojom::MojoCompositorFrameSinkRequest request) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(OffscreenCanvasCompositorFrameSinkProviderImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_COMPOSITOR_FRAME_SINK_PROVIDER_IMPL_H_