Mac: Fix flicker on gpu->nongpu transitions.

chrome/browser/renderer_host/render_widget_host.h

 // Copyright (c) 2009 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 CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_H_
 #pragma once
 
 #include <deque>
 #include <string>
@@ skipping 566 matching lines @@
 
   // Indicates whether a page is loading or not.
   bool is_loading_;
 
   // Indicates whether a page is hidden or not.
   bool is_hidden_;
 
   // True when a page is rendered directly via the GPU process.
   bool is_gpu_rendering_active_;
 
+#if defined(OS_MACOSX)
+  // True after gpu rendering has been deactivated but the non-gpu backing
+  // store has not been repainted yet.
+  bool needs_to_hide_gpu_view_on_paint_;
+#endif
+
   // Set if we are waiting for a repaint ack for the view.
   bool repaint_ack_pending_;
 
   // True when waiting for RESIZE_ACK.
   bool resize_ack_pending_;
 
   // The current size of the RenderWidget.
   gfx::Size current_size_;
 
   // The size we last sent as requested size to the renderer. |current_size_|
@@ skipping 93 matching lines @@
   // changed.
   bool suppress_next_char_events_;
 
   // Optional video YUV layer for used for out-of-process compositing.
   scoped_ptr<VideoLayer> video_layer_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHost);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_H_