CC::Animations should use TimeTicks & TimeDelta to represent time

cc/animation/layer_animation_controller.h

 // Copyright 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 CC_ANIMATION_LAYER_ANIMATION_CONTROLLER_H_
 #define CC_ANIMATION_LAYER_ANIMATION_CONTROLLER_H_
 
 #include "base/basictypes.h"
 #include "base/containers/hash_tables.h"
 #include "base/memory/ref_counted.h"
@@ skipping 34 matching lines @@
   void RemoveAnimation(int animation_id,
                        Animation::TargetProperty target_property);
   void AbortAnimations(Animation::TargetProperty target_property);
 
   // Ensures that the list of active animations on the main thread and the impl
   // thread are kept in sync. This function does not take ownership of the impl
   // thread controller. This method is virtual for testing.
   virtual void PushAnimationUpdatesTo(
       LayerAnimationController* controller_impl);
 
-  void Animate(double monotonic_time);
-  void AccumulatePropertyUpdates(double monotonic_time,
+  void Animate(base::TimeTicks monotonic_time);
+  void AccumulatePropertyUpdates(base::TimeTicks monotonic_time,
                                  AnimationEventsVector* events);
 
   void UpdateState(bool start_ready_animations,
                    AnimationEventsVector* events);
 
   // Returns the active animation in the given group, animating the given
   // property, if such an animation exists.
   Animation* GetAnimation(int group_id,
                           Animation::TargetProperty target_property) const;
 
@@ skipping 69 matching lines @@
  private:
   typedef base::hash_set<int> TargetProperties;
 
   void PushNewAnimationsToImplThread(
       LayerAnimationController* controller_impl) const;
   void RemoveAnimationsCompletedOnMainThread(
       LayerAnimationController* controller_impl) const;
   void PushPropertiesToImplThread(
       LayerAnimationController* controller_impl) const;
 
-  void StartAnimations(double monotonic_time);
-  void PromoteStartedAnimations(double monotonic_time,
+  void StartAnimations(base::TimeTicks monotonic_time);
+  void PromoteStartedAnimations(base::TimeTicks monotonic_time,
                                 AnimationEventsVector* events);
-  void MarkFinishedAnimations(double monotonic_time);
-  void MarkAnimationsForDeletion(double monotonic_time,
+  void MarkFinishedAnimations(base::TimeTicks monotonic_time);
+  void MarkAnimationsForDeletion(base::TimeTicks monotonic_time,
                                  AnimationEventsVector* events);
   void PurgeAnimationsMarkedForDeletion();
 
-  void TickAnimations(double monotonic_time);
+  void TickAnimations(base::TimeTicks monotonic_time);
 
   enum UpdateActivationType {
     NormalActivation,
     ForceActivation
   };
   void UpdateActivation(UpdateActivationType type);
 
   void NotifyObserversOpacityAnimated(float opacity);
   void NotifyObserversTransformAnimated(const gfx::Transform& transform);
   void NotifyObserversFilterAnimated(const FilterOperations& filter);
   void NotifyObserversScrollOffsetAnimated(const gfx::Vector2dF& scroll_offset);
 
   void NotifyObserversAnimationWaitingForDeletion();
 
   bool HasValueObserver();
   bool HasActiveValueObserver();
 
   AnimationRegistrar* registrar_;
   int id_;
   ScopedPtrVector<Animation> active_animations_;
 
   // This is used to ensure that we don't spam the registrar.
   bool is_active_;
 
-  double last_tick_time_;
+  base::TimeTicks last_tick_time_;
 
   ObserverList<LayerAnimationValueObserver> value_observers_;
   ObserverList<LayerAnimationEventObserver> event_observers_;
 
   LayerAnimationValueProvider* value_provider_;
 
   AnimationDelegate* layer_animation_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerAnimationController);
 };
 
 }  // namespace cc
 
 #endif  // CC_ANIMATION_LAYER_ANIMATION_CONTROLLER_H_