Add latency measurement system

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_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 224 matching lines @@
 
   // Overridden from ui::CompositorDelegate:
   virtual void ScheduleDraw() OVERRIDE;
 
   // Overridden from ui::CompositorObserver:
   virtual void OnCompositingDidCommit(ui::Compositor*) OVERRIDE;
   virtual void OnCompositingStarted(ui::Compositor*) OVERRIDE;
   virtual void OnCompositingEnded(ui::Compositor*) OVERRIDE;
   virtual void OnCompositingAborted(ui::Compositor*) OVERRIDE;
   virtual void OnCompositingLockStateChanged(ui::Compositor*) OVERRIDE;
+  virtual void OnReceivedLatencyInfo(ui::Compositor*,
+      const WebKit::WebLatencyInfoImpl&) 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;
 
   // Overridden from aura::client::CaptureDelegate:
   virtual void UpdateCapture(Window* old_capture, Window* new_capture) OVERRIDE;
@@ skipping 140 matching lines @@
   base::WeakPtrFactory<RootWindow> held_mouse_event_factory_;
 
   scoped_ptr<ui::ViewProp> prop_;
 
   DISALLOW_COPY_AND_ASSIGN(RootWindow);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_ROOT_WINDOW_H_