[cc] Fix CompositorFrameSinkSupport BeginFrameAck interface.

content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.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_H_
 #define CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_COMPOSITOR_FRAME_SINK_H_
 
 #include "cc/ipc/compositor_frame.mojom.h"
 #include "cc/ipc/mojo_compositor_frame_sink.mojom.h"
 #include "cc/resources/transferable_resource.h"
@@ skipping 14 matching lines @@
       const cc::FrameSinkId& frame_sink_id,
       cc::mojom::MojoCompositorFrameSinkRequest request,
       cc::mojom::MojoCompositorFrameSinkClientPtr client);
 
   ~OffscreenCanvasCompositorFrameSink() override;
 
   // Overridden from cc::mojom::MojoCompositorFrameSink:
   void SetNeedsBeginFrame(bool needs_begin_frame) override;
   void SubmitCompositorFrame(const cc::LocalSurfaceId& local_surface_id,
                              cc::CompositorFrame frame) override;
+  void BeginFrameDidNotSwap(const cc::BeginFrameAck& begin_frame_ack) override;
   void EvictFrame() override;
 
   // Overridden from cc::CompositorFrameSinkSupportClient:
   void DidReceiveCompositorFrameAck() override;
   void OnBeginFrame(const cc::BeginFrameArgs& args) override;
   void ReclaimResources(const cc::ReturnedResourceArray& resources) override;
   void WillDrawSurface(const cc::LocalSurfaceId& local_surface_id,
                        const gfx::Rect& damage_rect) override;
 
  private:
   void OnClientConnectionLost();
 
   OffscreenCanvasCompositorFrameSinkProviderImpl* const provider_;
 
   cc::CompositorFrameSinkSupport support_;
   cc::mojom::MojoCompositorFrameSinkClientPtr client_;
   cc::ReturnedResourceArray surface_returned_resources_;
   mojo::Binding<cc::mojom::MojoCompositorFrameSink> binding_;
 
   DISALLOW_COPY_AND_ASSIGN(OffscreenCanvasCompositorFrameSink);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_COMPOSITOR_FRAME_SINK_H_