Fixes black flash when accelerated composited paints the tab background

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_
 #pragma once
 
 #include <map>
 #include <vector>
@@ skipping 305 matching lines @@
   // Relative to the upper-left corner of the screen.
   gfx::Point unlocked_global_mouse_position_;
   // Last cursor position relative to screen. Used to compute movementX/Y.
   gfx::Point global_mouse_position_;
   // In mouse locked mode, we syntheticaly move the mouse cursor to the center
   // of the window when it reaches the window borders to avoid it going outside.
   // This flag is used to differentiate between these synthetic mouse move
   // events vs. normal mouse move events.
   bool synthetic_move_sent_;
 
-  // Signals we need to switch off the external texture as soon as the software
-  // backing store is updated.
-  bool needs_update_texture_;
+  // Signals that the accelerated compositing has been turned on or off.
+  // This is used to signal to turn off the external texture as soon as the
+  // software backing store is updated.
+  bool accelerated_compositing_state_changed_;
 
   // Used to prevent further resizes while a resize is pending.
   class ResizeLock;
   // These locks are the ones waiting for a texture of the right size to come
   // back from the renderer/GPU process.
   std::vector<linked_ptr<ResizeLock> > resize_locks_;
   // These locks are the ones waiting for a frame to be drawn.
   std::vector<linked_ptr<ResizeLock> > locks_pending_draw_;
 
   // This lock is for waiting for a front surface to become available to draw.
   scoped_refptr<aura::CompositorLock> released_front_lock_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAura);
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_