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

ui/views/widget/desktop_aura/desktop_native_widget_aura.h

Index: ui/views/widget/desktop_aura/desktop_native_widget_aura.h
diff --git a/ui/views/widget/desktop_aura/desktop_native_widget_aura.h b/ui/views/widget/desktop_aura/desktop_native_widget_aura.h
index 7a79db80853154de6b2eca496d6286195e9c3cbf..b71ddedfbffde5d60b011b9e5af8510714a701f0 100644
--- a/ui/views/widget/desktop_aura/desktop_native_widget_aura.h
+++ b/ui/views/widget/desktop_aura/desktop_native_widget_aura.h
@@ -35,6 +35,7 @@ class WindowModalityController;
 class DesktopRootWindowHost;
 class DropHelper;
 class NativeWidgetAuraWindowObserver;
+class NativeWidgetLayerReordererAura;
 class TooltipManagerAura;
 
 class VIEWS_EXPORT DesktopNativeWidgetAura
@@ -80,6 +81,7 @@ class VIEWS_EXPORT DesktopNativeWidgetAura
   virtual const ui::Compositor* GetCompositor() const OVERRIDE;
   virtual ui::Compositor* GetCompositor() OVERRIDE;
   virtual ui::Layer* GetLayer() OVERRIDE;
+  virtual void ReorderLayersForAttachedNativeViews() OVERRIDE;
   virtual void ViewRemoved(View* view) OVERRIDE;
   virtual void SetNativeWindowProperty(const char* name, void* value) OVERRIDE;
   virtual void* GetNativeWindowProperty(const char* name) const OVERRIDE;
@@ -238,6 +240,10 @@ class VIEWS_EXPORT DesktopNativeWidgetAura
 
   scoped_ptr<corewm::ShadowController> shadow_controller_;
 
+  // Reorders layers and windows based on the order of views with layers and
+  // views with attached windows in the widget's view hierarchy.
+  scoped_ptr<NativeWidgetLayerReordererAura> layer_reorderer_;
+
   DISALLOW_COPY_AND_ASSIGN(DesktopNativeWidgetAura);
 };