Mac: Fix bad framerate when capturing tab

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"
 
 @class CompositingIOSurfaceLayer;
 
 namespace content {
 class CompositingIOSurfaceMac;
 class CompositingIOSurfaceContext;
 
 // The interface through which the CompositingIOSurfaceLayer calls back into
 // the structrue that created it (RenderWidgetHostViewMac or
 // BrowserCompositorViewMac).
 class CompositingIOSurfaceLayerClient {
  public:
+  virtual bool AcceleratedLayerShouldAckImmediately() const = 0;
   virtual void AcceleratedLayerDidDrawFrame(bool succeeded) = 0;
 };
 
 // CompositingIOSurfaceLayerHelper provides C++ functionality needed for the
 // CompositingIOSurfaceLayer class, and does most of the heavy lifting for the
 // class.
 // TODO(ccameron): This class should own CompositingIOSurfaceLayer, rather than
 // vice versa.
 class CompositingIOSurfaceLayerHelper {
  public:
@@ skipping 74 matching lines @@
 // Mark that the client is no longer valid and cannot be called back into. This
 // must be called before the layer is destroyed.
 - (void)resetClient;
 
 // Called when a new frame is received.
 - (void)gotNewFrame;
 
 @end
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_COMPOSITING_IOSURFACE_LAYER_MAC_H_