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 5450baef084803fba005729f82973f2094961f1e..e472983acbef1608a14590ec1266fbbe5ba3daba 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
@@ -81,6 +82,8 @@ class VIEWS_EXPORT DesktopNativeWidgetAura
   virtual ui::Compositor* GetCompositor() OVERRIDE;
   virtual gfx::Vector2d CalculateOffsetToAncestorWithLayer(
       ui::Layer** layer_parent) OVERRIDE;
+  virtual void ReorderLayers() OVERRIDE;
+  virtual bool HasNativeViewAttachedToViewTree() const OVERRIDE;
   virtual void ViewRemoved(View* view) OVERRIDE;
   virtual void SetNativeWindowProperty(const char* name, void* value) OVERRIDE;
   virtual void* GetNativeWindowProperty(const char* name) const OVERRIDE;
@@ -239,6 +242,10 @@ 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);
 };