Adds two new observer methods to allow code to be notified when a Window is added/removed from a ...

ui/aura/root_window.h

Index: ui/aura/root_window.h
===================================================================
--- ui/aura/root_window.h	(revision 119955)
+++ ui/aura/root_window.h	(working copy)
@@ -192,13 +192,9 @@
   // Overridden from ui::CompositorDelegate:
   virtual void ScheduleDraw() OVERRIDE;
 
-  // Overridden from Window:
-  virtual void OnWindowAttachedToRootWindow(
-      Window* window) OVERRIDE;
-  virtual void OnWindowDetachingFromRootWindow(
-      Window* window) OVERRIDE;
+ private:
+  friend class Window;
 
- private:
   RootWindow();
   virtual ~RootWindow();
 
@@ -212,6 +208,10 @@
   ui::GestureStatus ProcessGestureEvent(Window* target, GestureEvent* event);
   bool ProcessGestures(GestureRecognizer::Gestures* gestures);
 
+  // Called when a Window is attached or detached from the RootWindow.
+  void OnWindowAddedToRootWindow(Window* window);
+  void OnWindowRemovedFromRootWindow(Window* window);
+
   // Overridden from Window:
   virtual bool CanFocus() const OVERRIDE;
   virtual bool CanReceiveEvents() const OVERRIDE;