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 c78d90c11cf83cc20def13831d6e8958913e3661..0be49aecbd6299327810f95963daf6a702a55006 100644
--- a/ui/views/widget/widget.cc
+++ b/ui/views/widget/widget.cc
@@ -884,6 +884,10 @@ ui::Layer* Widget::GetLayer() {
   return native_widget_->GetLayer();
 }
 
+void Widget::ReorderNativeViews() {
+  native_widget_->ReorderNativeViews();
+}
+
 void Widget::UpdateRootLayers() {
   // Calculate the layers requires traversing the tree, and since nearly any
   // mutation of the tree can trigger this call we delay until absolutely