Take MT jank into account when animating the scroll offset on CC

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 056c167423acd16e5fa24232b7f112ea984883be..6fae3289a10c565f71f830cf342e42c5af8843fa 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -173,7 +173,8 @@ class CC_EXPORT LayerTreeHostImpl
   ScrollStatus ScrollAnimatedBegin(const gfx::Point& viewport_point) override;
   InputHandler::ScrollStatus ScrollAnimated(
       const gfx::Point& viewport_point,
-      const gfx::Vector2dF& scroll_delta) override;
+      const gfx::Vector2dF& scroll_delta,
+      const ui::LatencyInfo* LatencyInfo) override;
   void ApplyScroll(ScrollNode* scroll_node, ScrollState* scroll_state);
   InputHandlerScrollResult ScrollBy(ScrollState* scroll_state) override;
   bool ScrollVerticallyByPage(const gfx::Point& viewport_point,
@@ -614,7 +615,8 @@ class CC_EXPORT LayerTreeHostImpl
   // Returns true if a scroll offset animation is created and false if we scroll
   // by the desired amount without an animation.
   bool ScrollAnimationCreate(ScrollNode* scroll_node,
-                             const gfx::Vector2dF& scroll_amount);
+                             const gfx::Vector2dF& scroll_amount,
+                             base::TimeTicks original_event_time);
 
   void SetLayerTreeMutator(std::unique_ptr<LayerTreeMutator> mutator);
   LayerTreeMutator* mutator() { return mutator_.get(); }