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

ui/views/widget/widget.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/widget/widget.h"
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/utf_string_conversions.h"
@@ skipping 868 matching lines @@
 ui::Compositor* Widget::GetCompositor() {
   return native_widget_->GetCompositor();
 }
 
 gfx::Vector2d Widget::CalculateOffsetToAncestorWithLayer(
     ui::Layer** layer_parent) {
   return native_widget_->CalculateOffsetToAncestorWithLayer(layer_parent);
 }
 
 void Widget::ReorderLayers() {
-  ui::Layer* layer = NULL;
-  CalculateOffsetToAncestorWithLayer(&layer);
-  if (layer)
-    root_view_->ReorderChildLayers(layer);
+  internal::NativeWidgetPrivate::ReorderLayers(GetNativeView(), GetRootView());
 }
 
 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
   // necessary.
   root_layers_dirty_ = true;
 }
 
 const NativeWidget* Widget::native_widget() const {
@@ skipping 507 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // internal::NativeWidgetPrivate, NativeWidget implementation:
 
 internal::NativeWidgetPrivate* NativeWidgetPrivate::AsNativeWidgetPrivate() {
   return this;
 }
 
 }  // namespace internal
 }  // namespace views