Notification on finish handling of top control gesture

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 fbc4a820f982496949dce7d3040f3a0518f703c4..3dff6e04629f66bd80988edd2bddfd4b9a1fab4e 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -1964,6 +1964,11 @@ void LayerTreeHostImpl::DidChangeTopControlsPosition() {
   SetFullRootLayerDamage();
 }
 
+void LayerTreeHostImpl::DidFinishTopControlsGesture() {
+  if (input_handler_client_)
+    input_handler_client_->DidFinishTopControlsGesture();
+}
+
 bool LayerTreeHostImpl::EnsureRenderSurfaceLayerList() {
   active_tree_->UpdateDrawProperties();
   return !active_tree_->RenderSurfaceLayerList().empty();
@@ -2018,9 +2023,6 @@ InputHandler::ScrollStatus LayerTreeHostImpl::ScrollBegin(
     gfx::Point viewport_point, InputHandler::ScrollInputType type) {
   TRACE_EVENT0("cc", "LayerTreeHostImpl::ScrollBegin");
 
-  if (top_controls_manager_)
-    top_controls_manager_->ScrollBegin();
-
   DCHECK(!CurrentlyScrollingLayer());
   ClearCurrentlyScrollingLayer();
 
@@ -2046,6 +2048,9 @@ InputHandler::ScrollStatus LayerTreeHostImpl::ScrollBegin(
     potentially_scrolling_layer_impl = RootScrollLayer();
 
   if (potentially_scrolling_layer_impl) {
+    if (top_controls_manager_)
+      top_controls_manager_->ScrollBegin();
+
     active_tree_->SetCurrentlyScrollingLayer(
         potentially_scrolling_layer_impl);
     should_bubble_scrolls_ = (type != NonBubblingGesture);