Tighter sync and faster ACK on SwapBuffers/PostSubBuffers

ui/aura/root_window.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 UI_AURA_ROOT_WINDOW_H_
 #define UI_AURA_ROOT_WINDOW_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 240 matching lines @@
   // Overridden from Window:
   virtual RootWindow* GetRootWindow() OVERRIDE;
   virtual const RootWindow* GetRootWindow() const OVERRIDE;
   virtual void SetTransform(const ui::Transform& transform) OVERRIDE;
 
   // Overridden from ui::CompositorDelegate:
   virtual void ScheduleDraw() OVERRIDE;
 
   // Overridden from ui::CompositorObserver:
   virtual void OnCompositingStarted(ui::Compositor*) OVERRIDE;
+  virtual void OnCompositingWillEnd(ui::Compositor*) OVERRIDE;
   virtual void OnCompositingEnded(ui::Compositor*) OVERRIDE;
 
   // Overridden from ui::LayerDelegate:
   virtual void OnDeviceScaleFactorChanged(float device_scale_factor) OVERRIDE;
 
   // Overridden from Window:
   virtual bool CanFocus() const OVERRIDE;
   virtual bool CanReceiveEvents() const OVERRIDE;
   virtual FocusManager* GetFocusManager() OVERRIDE;
 
@@ skipping 127 matching lines @@
 
   // How many holds are outstanding. We try to defer dispatching mouse moves
   // while the count is > 0.
   int mouse_move_hold_count_;
   bool should_hold_mouse_moves_;
   scoped_ptr<MouseEvent> held_mouse_move_;
 
   CompositorLock* compositor_lock_;
   bool draw_on_compositor_unlock_;
 
-  int draw_trace_count_;
-
   DISALLOW_COPY_AND_ASSIGN(RootWindow);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_ROOT_WINDOW_H_