Blink handle selection handle visibility

cc/trees/layer_tree_impl.cc

Index: cc/trees/layer_tree_impl.cc
diff --git a/cc/trees/layer_tree_impl.cc b/cc/trees/layer_tree_impl.cc
index ff5da70a7e7ec633092d56de8cc7282b1316b21e..9586f942f211c064ff9b740c6ca5f619944c6849 100644
--- a/cc/trees/layer_tree_impl.cc
+++ b/cc/trees/layer_tree_impl.cc
@@ -1931,9 +1931,15 @@ LayerImpl* LayerTreeImpl::FindLayerThatIsHitByPointInTouchHandlerRegion(
 }
 
 void LayerTreeImpl::RegisterSelection(const LayerSelection& selection) {
+  handle_visibility_changed_ =
+      selection_.is_handle_visible != selection.is_handle_visible;
   selection_ = selection;
 }
 
+bool LayerTreeImpl::HandleVisibilityChanged() {
+  return handle_visibility_changed_;
+}
+
 static gfx::SelectionBound ComputeViewportSelectionBound(
     const LayerSelectionBound& layer_bound,
     LayerImpl* layer,
@@ -1996,6 +2002,7 @@ void LayerTreeImpl::GetViewportSelection(
       device_scale_factor());
   selection->is_editable = selection_.is_editable;
   selection->is_empty_text_form_control = selection_.is_empty_text_form_control;
+  selection->is_handle_visible = selection_.is_handle_visible;
   if (selection->start.type() == gfx::SelectionBound::CENTER ||
       selection->start.type() == gfx::SelectionBound::EMPTY) {
     selection->end = selection->start;