[cc] Add and plumb CFS::DidNotProduceFrame.

content/browser/compositor/gpu_vsync_begin_frame_source.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_COMPOSITOR_GPU_VSYNC_BEGIN_FRAME_SOURCE_H_
 #define CONTENT_BROWSER_COMPOSITOR_GPU_VSYNC_BEGIN_FRAME_SOURCE_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "cc/scheduler/begin_frame_source.h"
 
 namespace content {
 
 // This class is used to control VSync production on GPU side.
 class GpuVSyncControl {
  public:
   virtual void SetNeedsVSync(bool needs_vsync) = 0;
 };
 
 // This is a type of ExternalBeginFrameSource where VSync signals are
 // generated externally on GPU side.
 class GpuVSyncBeginFrameSource : public cc::ExternalBeginFrameSource,
                                  cc::ExternalBeginFrameSourceClient {
  public:
   explicit GpuVSyncBeginFrameSource(GpuVSyncControl* vsync_control);
   ~GpuVSyncBeginFrameSource() override;
 
   // cc::ExternalBeginFrameSourceClient implementation.
   void OnNeedsBeginFrames(bool needs_begin_frames) override;
-  void OnDidFinishFrame(const cc::BeginFrameAck& ack) override;
 
   void OnVSync(base::TimeTicks timestamp, base::TimeDelta interval);
 
  private:
   GpuVSyncControl* const vsync_control_;
   bool needs_begin_frames_;
   uint64_t next_sequence_number_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuVSyncBeginFrameSource);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_GPU_VSYNC_BEGIN_FRAME_SOURCE_H_