Remove GpuHostMsg_FrameDrawn and replace with client channel swap ack

content/browser/compositor/gpu_browser_compositor_output_surface.h

 // Copyright 2014 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_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_
 #define CONTENT_BROWSER_COMPOSITOR_GPU_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_
 
+#include "base/cancelable_callback.h"
 #include "content/browser/compositor/browser_compositor_output_surface.h"
 
 namespace ui {
 class CompositorVSyncManager;
 }
 
 namespace cc {
 class OverlayCandidateValidator;
 }
 
 namespace content {
+class CommandBufferProxyImpl;
 
 // Adapts a WebGraphicsContext3DCommandBufferImpl into a
 // cc::OutputSurface that also handles vsync parameter updates
 // arriving from the GPU process.
 class GpuBrowserCompositorOutputSurface
     : public BrowserCompositorOutputSurface {
  public:
   GpuBrowserCompositorOutputSurface(
       const scoped_refptr<ContextProviderCommandBuffer>& context,
       int surface_id,
       IDMap<BrowserCompositorOutputSurface>* output_surface_map,
       const scoped_refptr<ui::CompositorVSyncManager>& vsync_manager,
       scoped_ptr<cc::OverlayCandidateValidator> overlay_candidate_validator);
 
   virtual ~GpuBrowserCompositorOutputSurface();
 
  protected:
   // cc::OutputSurface implementation.
   virtual void SwapBuffers(cc::CompositorFrame* frame) override;
+  virtual bool BindToClient(cc::OutputSurfaceClient* client) override;
+
+  CommandBufferProxyImpl* GetCommandBufferProxy();
+  void OnSwapBuffersCompleted(const std::vector<ui::LatencyInfo>& latency_info);
+
+  base::CancelableCallback<void(const std::vector<ui::LatencyInfo>&)>
+      swap_buffers_completion_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuBrowserCompositorOutputSurface);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_GPU_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_