Mac: Fix bad framerate when capturing tab

content/browser/compositor/browser_compositor_view_private_mac.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_VIEW_PRIVATE_MAC_H_
 #define CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_VIEW_PRIVATE_MAC_H_
 
 #include "content/browser/compositor/browser_compositor_view_mac.h"
 
 @class BrowserCompositorViewCocoa;
@@ skipping 39 matching lines @@
       int output_surface_id,
       const std::vector<ui::LatencyInfo>& latency_info,
       gfx::Size pixel_size,
       float scale_factor) OVERRIDE;
   virtual void GotSoftwareFrame(
       cc::SoftwareFrameData* frame_data,
       float scale_factor,
       SkCanvas* canvas) OVERRIDE;
 
   // CompositingIOSurfaceLayerClient implementation:
+  virtual bool AcceleratedLayerShouldAckImmediately() const OVERRIDE;
   virtual void AcceleratedLayerDidDrawFrame(bool succeeded) OVERRIDE;
 
   // The client of the BrowserCompositorViewMac that is using this as its
   // internals.
   BrowserCompositorViewMacClient* client_;
 
   // The NSView drawn by the |compositor_|
   base::scoped_nsobject<BrowserCompositorViewCocoa> cocoa_view_;
 
   // The compositor drawing the contents of |cooca_view_|. Note that this must
@@ skipping 27 matching lines @@
 }
 
 - (id)initWithClient:(content::BrowserCompositorViewCocoaClient*)client;
 
 // Mark that the client provided at initialization is no longer valid and may
 // not be called back into.
 - (void)resetClient;
 @end
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_VIEW_PRIVATE_MAC_H_