Mac ÜC: Enable back-pressure for the browser compositor

content/browser/compositor/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_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_
 #define CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_
 
 #include "base/id_map.h"
 #include "base/threading/non_thread_safe.h"
 #include "cc/output/output_surface.h"
@@ skipping 11 matching lines @@
 
 class CONTENT_EXPORT BrowserCompositorOutputSurface
     : public cc::OutputSurface,
       public ui::CompositorVSyncManager::Observer,
       public base::NonThreadSafe {
  public:
   virtual ~BrowserCompositorOutputSurface();
 
   // cc::OutputSurface implementation.
   virtual bool BindToClient(cc::OutputSurfaceClient* client) OVERRIDE;
+  virtual void OnSwapBuffersComplete() OVERRIDE;
 
   // ui::CompositorOutputSurface::Observer implementation.
   virtual void OnUpdateVSyncParameters(base::TimeTicks timebase,
                                        base::TimeDelta interval) OVERRIDE;
 
   void OnUpdateVSyncParametersFromGpu(base::TimeTicks tiembase,
                                       base::TimeDelta interval);
 
   void SetReflector(ReflectorImpl* reflector);
 
+#if defined(OS_MACOSX)
+  void OnSurfaceDisplayed();
+#endif
+
  protected:
   // Constructor used by the accelerated implementation.
   BrowserCompositorOutputSurface(
       const scoped_refptr<ContextProviderCommandBuffer>& context,
       int surface_id,
       IDMap<BrowserCompositorOutputSurface>* output_surface_map,
       const scoped_refptr<ui::CompositorVSyncManager>& vsync_manager);
 
   // Constructor used by the software implementation.
   BrowserCompositorOutputSurface(
@@ skipping 10 matching lines @@
 
  private:
   void Initialize();
 
   DISALLOW_COPY_AND_ASSIGN(BrowserCompositorOutputSurface);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_