Add latency measurement system

ash/wm/window_animations.cc

 // 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.
 
 #include "ash/wm/window_animations.h"
 
 #include <math.h>
 
 #include <algorithm>
 #include <vector>
@@ skipping 281 matching lines @@
   }
   virtual void OnCompositingEnded(ui::Compositor* compositor) OVERRIDE {
   }
   virtual void OnCompositingAborted(ui::Compositor* compositor) OVERRIDE {
     // Triggers OnImplicitAnimationsCompleted() to be called and deletes us.
     layer_->GetAnimator()->StopAnimating();
   }
   virtual void OnCompositingLockStateChanged(
       ui::Compositor* compositor) OVERRIDE {
   }
+  virtual void OnReceivedLatencyInfo(ui::Compositor*,
+      const WebKit::WebLatencyInfoImpl&) OVERRIDE {
+  }
 
   // aura::WindowObserver overrides:
   virtual void OnWindowDestroying(aura::Window* window) OVERRIDE {
     // Triggers OnImplicitAnimationsCompleted() to be called and deletes us.
     layer_->GetAnimator()->StopAnimating();
   }
 
   // ui::ImplicitAnimationObserver overrides:
   virtual void OnImplicitAnimationsCompleted() OVERRIDE {
     delete this;
@@ skipping 198 matching lines @@
       type == LAYER_SCALE_ANIMATION_ABOVE ? kLayerScaleAboveSize :
           kLayerScaleBelowSize;
   gfx::Transform transform;
   transform.Translate(-layer->bounds().width() * (scale - 1.0f) / 2,
                       -layer->bounds().height() * (scale - 1.0f) / 2);
   transform.Scale(scale, scale);
   layer->SetTransform(transform);
 }
 
 }  // namespace ash