Replace CurrentPhysicalTimeTicks with a fallback in CurrentFrameTimeTicks.

cc/trees/layer_tree_host_impl.h

 // Copyright 2011 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_TREES_LAYER_TREE_HOST_IMPL_H_
 #define CC_TREES_LAYER_TREE_HOST_IMPL_H_
 
 #include <list>
 #include <set>
 #include <string>
@@ skipping 370 matching lines @@
     return accumulated_root_overscroll_;
   }
   gfx::Vector2dF current_fling_velocity() const {
     return current_fling_velocity_;
   }
 
   bool pinch_gesture_active() const { return pinch_gesture_active_; }
 
   void SetTreePriority(TreePriority priority);
 
+  void UpdateCurrentFrameTime();
   void ResetCurrentFrameTimeForNextFrame();
   virtual base::TimeTicks CurrentFrameTimeTicks();
 
-  virtual base::TimeTicks CurrentPhysicalTimeTicks() const;
-
   scoped_ptr<base::Value> AsValue() const { return AsValueWithFrame(NULL); }
   scoped_ptr<base::Value> AsValueWithFrame(FrameData* frame) const;
   scoped_ptr<base::Value> ActivationStateAsValue() const;
 
   bool page_scale_animation_active() const { return !!page_scale_animation_; }
 
   virtual void CreateUIResource(UIResourceId uid,
                                 const UIResourceBitmap& bitmap);
   // Deletes a UI resource.  May safely be called more than once.
   virtual void DeleteUIResource(UIResourceId uid);
@@ skipping 92 matching lines @@
   void SendReleaseResourcesRecursive(LayerImpl* current);
   bool EnsureRenderSurfaceLayerList();
   void ClearCurrentlyScrollingLayer();
 
   bool HandleMouseOverScrollbar(LayerImpl* layer_impl,
                                 const gfx::PointF& device_viewport_point);
 
   void AnimateScrollbarsRecursive(LayerImpl* layer,
                                   base::TimeTicks time);
 
-  void UpdateCurrentFrameTime(base::TimeTicks* ticks) const;
-
   LayerImpl* FindScrollLayerForDeviceViewportPoint(
       const gfx::PointF& device_viewport_point,
       InputHandler::ScrollInputType type,
       LayerImpl* layer_hit_by_point,
       bool* scroll_on_main_thread) const;
   float DeviceSpaceDistanceToLayer(const gfx::PointF& device_viewport_point,
                                    LayerImpl* layer_impl);
   void StartScrollbarAnimationRecursive(LayerImpl* layer, base::TimeTicks time);
   void SetManagedMemoryPolicy(const ManagedMemoryPolicy& policy,
                               bool zero_budget);
@@ skipping 136 matching lines @@
   int id_;
 
   std::set<SwapPromiseMonitor*> swap_promise_monitor_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_IMPL_H_