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

content/browser/renderer_host/compositing_iosurface_layer_mac.h

 // Copyright 2013 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_COMPOSITING_IOSURFACE_LAYER_MAC_H_
 #define CONTENT_BROWSER_RENDERER_HOST_COMPOSITING_IOSURFACE_LAYER_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/scoped_cftyperef.h"
 #include "base/memory/ref_counted.h"
 #include "base/timer/timer.h"
 
 namespace content {
 class CompositingIOSurfaceMac;
 class CompositingIOSurfaceContext;
 class CompositingIOSurfaceLayerHelper;
 
 class CompositingIOSurfaceLayerClient {
  public:
   virtual void AcceleratedLayerDidDrawFrame(bool succeeded) = 0;
 };
 
-}
+}  // namespace content
 
 // The CoreAnimation layer for drawing accelerated content.
 @interface CompositingIOSurfaceLayer : CAOpenGLLayer {
  @private
   content::CompositingIOSurfaceLayerClient* client_;
   scoped_refptr<content::CompositingIOSurfaceMac> iosurface_;
   scoped_refptr<content::CompositingIOSurfaceContext> context_;
 
   // The browser places back-pressure on the GPU by not acknowledging swap
   // calls until they appear on the screen. This can lead to hangs if the
@@ skipping 25 matching lines @@
 
 // Mark that the client is no longer valid and cannot be called back into.
 - (void)resetClient;
 
 // Called when a new frame is received.
 - (void)gotNewFrame;
 
 @end
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_COMPOSITING_IOSURFACE_LAYER_MAC_H_