Mac ÜC: Enable GPU back-pressure from the browser to the renderer

content/browser/renderer_host/render_widget_host_view_aura.h

 // Copyright (c) 2012 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_RENDER_WIDGET_HOST_VIEW_AURA_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 404 matching lines @@
 
   // Called prior to removing |window_| from a WindowEventDispatcher.
   void RemovingFromRootWindow();
 
   // DelegatedFrameHostClient implementation.
   virtual ui::Compositor* GetCompositor() const OVERRIDE;
   virtual ui::Layer* GetLayer() OVERRIDE;
   virtual RenderWidgetHostImpl* GetHost() OVERRIDE;
   virtual void SchedulePaintInRect(
       const gfx::Rect& damage_rect_in_dip) OVERRIDE;
+  virtual void DelegatedCompositorDidSwapBuffers() OVERRIDE {}
+  virtual void DelegatedCompositorAbortedSwapBuffers() OVERRIDE {}
   virtual bool IsVisible() OVERRIDE;
   virtual scoped_ptr<ResizeLock> CreateResizeLock(
       bool defer_compositor_lock) OVERRIDE;
   virtual gfx::Size DesiredFrameSize() OVERRIDE;
   virtual float CurrentDeviceScaleFactor() OVERRIDE;
   virtual gfx::Size ConvertViewSizeToPixel(const gfx::Size& size) OVERRIDE;
 
   // Detaches |this| from the input method object.
   void DetachFromInputMethod();
 
@@ skipping 147 matching lines @@
   // etc.
   scoped_ptr<content::LegacyRenderWidgetHostHWND>
       legacy_render_widget_host_HWND_;
 #endif
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAura);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_