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

ui/views/widget/widget.h

 // 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.
 
 #ifndef UI_VIEWS_WIDGET_WIDGET_H_
 #define UI_VIEWS_WIDGET_WIDGET_H_
 
 #include <set>
 #include <stack>
 #include <vector>
@@ skipping 559 matching lines @@
   const ui::Compositor* GetCompositor() const;
   ui::Compositor* GetCompositor();
 
   // Invokes method of same name on the NativeWidget.
   gfx::Vector2d CalculateOffsetToAncestorWithLayer(
       ui::Layer** layer_parent);
 
   // Invokes method of same name on the NativeWidget.
   void ReorderLayers();
 
+  // Returns true if a child NativeView is attached to one of the widget's
+  // views.
+  bool HasNativeViewAttachedToViewTree() const;
+
   // Schedules an update to the root layers. The actual processing occurs when
   // GetRootLayers() is invoked.
   void UpdateRootLayers();
 
   const NativeWidget* native_widget() const;
   NativeWidget* native_widget();
 
   internal::NativeWidgetPrivate* native_widget_private() {
     return native_widget_;
   }
@@ skipping 243 matching lines @@
   // True when window movement via mouse interaction with the frame should be
   // disabled.
   bool movement_disabled_;
 
   DISALLOW_COPY_AND_ASSIGN(Widget);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_WIDGET_H_