Propagate window transformed notification to child hierarchy

ui/aura/window_observer.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_AURA_WINDOW_OBSERVER_H_
 #define UI_AURA_WINDOW_OBSERVER_H_
 
 #include "base/basictypes.h"
 #include "base/strings/string16.h"
 #include "ui/aura/aura_export.h"
@@ skipping 64 matching lines @@
   // Invoked when SetBounds() is invoked on |window|. |old_bounds| and
   // |new_bounds| are in parent coordinates.
   virtual void OnWindowBoundsChanged(Window* window,
                                      const gfx::Rect& old_bounds,
                                      const gfx::Rect& new_bounds) {}
 
   // Invoked when SetTransform() is invoked on |window|.
   virtual void OnWindowTransforming(Window* window) {}
   virtual void OnWindowTransformed(Window* window) {}
 
+  // Invoked when SetTransform() is invoked on an ancestor of the window being
+  // observed (including the window itself).
+  virtual void OnAncestorWindowTransformed(Window* source, Window* window) {}
+
   // Invoked when |window|'s position among its siblings in the stacking order
   // has changed.
   virtual void OnWindowStackingChanged(Window* window) {}
 
   // Invoked when a region of |window| has damage from a new delegated frame.
   virtual void OnDelegatedFrameDamage(Window* window,
                                       const gfx::Rect& damage_rect_in_dip) {}
 
   // Invoked when the Window is being destroyed (i.e. from the start of its
   // destructor). This is called before the window is removed from its parent.
@@ skipping 36 matching lines @@
   // Tracks the number of windows being observed to track down
   // http://crbug.com/365364.
   int observing_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowObserver);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_WINDOW_OBSERVER_H_