Removing the use of base::Time inside the LayerTreeHost system.

cc/trees/layer_tree_host_impl.h

Index: cc/trees/layer_tree_host_impl.h
diff --git a/cc/trees/layer_tree_host_impl.h b/cc/trees/layer_tree_host_impl.h
index 3844a844ee9e6c0685ae6b08100c798ad1dcc44b..ccfb625cd73a6470799122aef185a3fd5f77a3de 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -74,7 +74,7 @@ class LayerTreeHostImplClient {
   virtual void SetNeedsManageTilesOnImplThread() = 0;
   virtual void PostAnimationEventsToMainThreadOnImplThread(
       scoped_ptr<AnimationEventsVector> events,
-      base::Time wall_clock_time) = 0;
+      base::TimeTicks clock_time) = 0;
   // Returns true if resources were deleted by this call.
   virtual bool ReduceContentsTextureMemoryOnImplThread(
       size_t limit_bytes,
@@ -166,8 +166,7 @@ class CC_EXPORT LayerTreeHostImpl
   virtual void BeginMainFrameAborted(bool did_handle);
   virtual void BeginCommit();
   virtual void CommitComplete();
-  virtual void Animate(base::TimeTicks monotonic_time,
-                       base::Time wall_clock_time);
+  virtual void Animate(base::TimeTicks monotonic_time);
   virtual void UpdateAnimationState(bool start_ready_animations);
   void MainThreadHasStoppedFlinging();
   void UpdateBackgroundAnimateTicking(bool should_background_tick);
@@ -386,7 +385,6 @@ class CC_EXPORT LayerTreeHostImpl
 
   void ResetCurrentFrameTimeForNextFrame();
   virtual base::TimeTicks CurrentFrameTimeTicks();
-  base::Time CurrentFrameTime();
 
   virtual base::TimeTicks CurrentPhysicalTimeTicks() const;
 
@@ -440,8 +438,7 @@ class CC_EXPORT LayerTreeHostImpl
       int id);
 
   // Virtual for testing.
-  virtual void AnimateLayers(base::TimeTicks monotonic_time,
-                             base::Time wall_clock_time);
+  virtual void AnimateLayers(base::TimeTicks monotonic_time);
 
   // Virtual for testing.
   virtual base::TimeDelta LowFrequencyAnimationInterval() const;
@@ -500,7 +497,7 @@ class CC_EXPORT LayerTreeHostImpl
   void AnimateScrollbarsRecursive(LayerImpl* layer,
                                   base::TimeTicks time);
 
-  void UpdateCurrentFrameTime(base::TimeTicks* ticks, base::Time* now) const;
+  void UpdateCurrentFrameTime(base::TimeTicks* ticks) const;
 
   LayerImpl* FindScrollLayerForDeviceViewportPoint(
       const gfx::PointF& device_viewport_point,
@@ -575,7 +572,7 @@ class CC_EXPORT LayerTreeHostImpl
 
   // This is set by AnimateLayers() and used by UpdateAnimationState()
   // when sending animation events to the main thread.
-  base::Time last_animation_time_;
+  base::TimeTicks last_animation_time_;
 
   scoped_ptr<TopControlsManager> top_controls_manager_;
 
@@ -637,7 +634,6 @@ class CC_EXPORT LayerTreeHostImpl
   gfx::Rect viewport_damage_rect_;
 
   base::TimeTicks current_frame_timeticks_;
-  base::Time current_frame_time_;
 
   scoped_ptr<AnimationRegistrar> animation_registrar_;