gfx: Add FrameTime and DisplayTime classes

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 eda2f25d3733de1ff107eded1aa3de410c1d6f39..f6cbe0702cb9eae4983369c66e07379e4d887cea 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -158,7 +158,7 @@ class CC_EXPORT LayerTreeHostImpl
 
   virtual void BeginCommit();
   virtual void CommitComplete();
-  virtual void Animate(base::TimeTicks monotonic_time,
+  virtual void Animate(gfx::FrameTime monotonic_time,
                        base::Time wall_clock_time);
   virtual void UpdateAnimationState(bool start_ready_animations);
   void MainThreadHasStoppedFlinging();
@@ -173,7 +173,7 @@ class CC_EXPORT LayerTreeHostImpl
   // two.
   virtual bool PrepareToDraw(FrameData* frame,
                              gfx::Rect device_viewport_damage_rect);
-  virtual void DrawLayers(FrameData* frame, base::TimeTicks frame_begin_time);
+  virtual void DrawLayers(FrameData* frame, gfx::FrameTime frame_begin_time);
   // Must be called if and only if PrepareToDraw was called.
   void DidDrawAllLayers(const FrameData& frame);
 
@@ -381,10 +381,10 @@ class CC_EXPORT LayerTreeHostImpl
   void SetTreePriority(TreePriority priority);
 
   void ResetCurrentFrameTimeForNextFrame();
-  virtual base::TimeTicks CurrentFrameTimeTicks();
+  virtual gfx::FrameTime CurrentFrameTimeTicks();
   base::Time CurrentFrameTime();
 
-  virtual base::TimeTicks CurrentPhysicalTimeTicks() const;
+  virtual gfx::FrameTime CurrentPhysicalFrameTime() const;
 
   scoped_ptr<base::Value> AsValue() const { return AsValueWithFrame(NULL); }
   scoped_ptr<base::Value> AsValueWithFrame(FrameData* frame) const;
@@ -416,7 +416,7 @@ class CC_EXPORT LayerTreeHostImpl
       SharedBitmapManager* manager);
 
   // Virtual for testing.
-  virtual void AnimateLayers(base::TimeTicks monotonic_time,
+  virtual void AnimateLayers(gfx::FrameTime monotonic_time,
                              base::Time wall_clock_time);
 
   // Virtual for testing.
@@ -443,9 +443,9 @@ class CC_EXPORT LayerTreeHostImpl
   void ReleaseTreeResources();
   void EnforceZeroBudget(bool zero_budget);
 
-  void AnimatePageScale(base::TimeTicks monotonic_time);
-  void AnimateScrollbars(base::TimeTicks monotonic_time);
-  void AnimateTopControls(base::TimeTicks monotonic_time);
+  void AnimatePageScale(gfx::FrameTime monotonic_time);
+  void AnimateScrollbars(gfx::FrameTime monotonic_time);
+  void AnimateTopControls(gfx::FrameTime monotonic_time);
 
   gfx::Vector2dF ScrollLayerWithViewportSpaceDelta(
       LayerImpl* layer_impl,
@@ -473,9 +473,9 @@ class CC_EXPORT LayerTreeHostImpl
                                 gfx::PointF device_viewport_point);
 
   void AnimateScrollbarsRecursive(LayerImpl* layer,
-                                  base::TimeTicks time);
+                                  gfx::FrameTime time);
 
-  void UpdateCurrentFrameTime(base::TimeTicks* ticks, base::Time* now) const;
+  void UpdateCurrentFrameTime(gfx::FrameTime *ticks, base::Time* now) const;
 
   LayerImpl* FindScrollLayerForDeviceViewportPoint(
       gfx::PointF device_viewport_point,
@@ -484,7 +484,8 @@ class CC_EXPORT LayerTreeHostImpl
       bool* scroll_on_main_thread) const;
   float DeviceSpaceDistanceToLayer(gfx::PointF device_viewport_point,
                                    LayerImpl* layer_impl);
-  void StartScrollbarAnimationRecursive(LayerImpl* layer, base::TimeTicks time);
+  void StartScrollbarAnimationRecursive(LayerImpl* layer,
+                                        gfx::FrameTime time);
   void SetManagedMemoryPolicy(const ManagedMemoryPolicy& policy,
                               bool zero_budget);
   void EnforceManagedMemoryPolicy(const ManagedMemoryPolicy& policy);
@@ -610,7 +611,7 @@ class CC_EXPORT LayerTreeHostImpl
 
   gfx::Rect viewport_damage_rect_;
 
-  base::TimeTicks current_frame_timeticks_;
+  gfx::FrameTime current_frame_timeticks_;
   base::Time current_frame_time_;
 
   scoped_ptr<AnimationRegistrar> animation_registrar_;