Reorder the NativeViews attached to a view via kViewHostKey according to the position of the view

ui/views/widget/widget.cc

Index: ui/views/widget/widget.cc
diff --git a/ui/views/widget/widget.cc b/ui/views/widget/widget.cc
index b1e17ada0f0fbe6c279d3833e9726e6c562ef434..fb8314661cb11202bff0fba7a44cfb8df729f12e 100644
--- a/ui/views/widget/widget.cc
+++ b/ui/views/widget/widget.cc
@@ -886,10 +886,11 @@ gfx::Vector2d Widget::CalculateOffsetToAncestorWithLayer(
 }
 
 void Widget::ReorderLayers() {
-  ui::Layer* layer = NULL;
-  CalculateOffsetToAncestorWithLayer(&layer);
-  if (layer)
-    root_view_->ReorderChildLayers(layer);
+  native_widget_->ReorderLayers();
+}
+
+bool Widget::HasNativeViewAttachedToViewTree() const {
+  return native_widget_->HasNativeViewAttachedToViewTree();
 }
 
 void Widget::UpdateRootLayers() {