NOT FOR LANDING - [WebView] Allow fling animation via the LayerScrollOffsetDelegate

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 b9070ac13ae599d46efc792fe896acf2532d3599..8672a7169d4c8590524cffb7f6e4ed7a4e0c89e7 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -144,7 +144,7 @@ class CC_EXPORT LayerTreeHostImpl
                                        bool anchor_point,
                                        float page_scale,
                                        base::TimeDelta duration) OVERRIDE;
-  virtual void SetNeedsAnimate() OVERRIDE;
+  virtual void SetNeedsAnimateFling() OVERRIDE;
   virtual bool IsCurrentlyScrollingLayerAt(
       const gfx::Point& viewport_point,
       InputHandler::ScrollInputType type) OVERRIDE;
@@ -311,6 +311,7 @@ class CC_EXPORT LayerTreeHostImpl
   bool visible() const { return visible_; }
 
   void SetNeedsCommit() { client_->SetNeedsCommitOnImplThread(); }
+  void SetNeedsAnimate();
   void SetNeedsRedraw();
 
   ManagedMemoryPolicy ActualManagedMemoryPolicy() const;
@@ -494,6 +495,7 @@ class CC_EXPORT LayerTreeHostImpl
   void EnforceZeroBudget(bool zero_budget);
 
   void ScrollViewportBy(gfx::Vector2dF scroll_delta);
+  void AnimateFling(base::TimeTicks monotonic_time);
   void AnimatePageScale(base::TimeTicks monotonic_time);
   void AnimateScrollbars(base::TimeTicks monotonic_time);
   void AnimateTopControls(base::TimeTicks monotonic_time);