Fix scrollbar fade animation scheduling.

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index ec59daebabffa8e7d12aef3499182558636e0290..cbcbef93e4fce33cff86054717030f1bcbca5198 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -1927,7 +1927,7 @@ void LayerTreeHostImpl::ScrollEnd() {
   if (top_controls_manager_)
     top_controls_manager_->ScrollEnd();
   ClearCurrentlyScrollingLayer();
-  StartScrollbarAnimation(CurrentFrameTimeTicks());
+  StartScrollbarAnimation();
 }
 
 InputHandler::ScrollStatus LayerTreeHostImpl::FlingScrollBegin() {
@@ -2199,9 +2199,9 @@ void LayerTreeHostImpl::AnimateScrollbarsRecursive(LayerImpl* layer,
     AnimateScrollbarsRecursive(layer->children()[i], time);
 }
 
-void LayerTreeHostImpl::StartScrollbarAnimation(base::TimeTicks time) {
+void LayerTreeHostImpl::StartScrollbarAnimation() {
   TRACE_EVENT0("cc", "LayerTreeHostImpl::StartScrollbarAnimation");
-  StartScrollbarAnimationRecursive(RootLayer(), time);
+  StartScrollbarAnimationRecursive(RootLayer(), base::TimeTicks::Now());
 }
 
 void LayerTreeHostImpl::StartScrollbarAnimationRecursive(LayerImpl* layer,