aura: Make shadows be children of window layers.

ui/aura_shell/shadow_controller.h

 // Copyright (c) 2011 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_SHELL_SHADOW_CONTROLLER_H_
 #define UI_AURA_SHELL_SHADOW_CONTROLLER_H_
 #pragma once
 
 #include <map>
 
@@ skipping 36 matching lines @@
     DISALLOW_COPY_AND_ASSIGN(TestApi);
   };
 
   explicit ShadowController();
   virtual ~ShadowController();
 
   // aura::DesktopObserver override:
   virtual void OnWindowInitialized(aura::Window* window) OVERRIDE;
 
   // aura::WindowObserver overrides:
-  virtual void OnWindowParentChanged(
-      aura::Window* window, aura::Window* parent) OVERRIDE;
   virtual void OnWindowPropertyChanged(
       aura::Window* window, const char* name, void* old) OVERRIDE;
-  virtual void OnWindowVisibilityChanged(
-      aura::Window* window, bool visible) OVERRIDE;
   virtual void OnWindowBoundsChanged(
       aura::Window* window, const gfx::Rect& bounds) OVERRIDE;
-  virtual void OnWindowStackingChanged(aura::Window* window) OVERRIDE;
   virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE;
 
  private:
   typedef std::map<aura::Window*, linked_ptr<Shadow> > WindowShadowMap;
 
   // Checks if |window| is visible and contains a property requesting a shadow.
   bool ShouldShowShadowForWindow(aura::Window* window) const;
 
   // Returns |window|'s shadow from |window_shadows_|, or NULL if no shadow
   // exists.
   Shadow* GetShadowForWindow(aura::Window* window);
 
   // Shows or hides |window|'s shadow as needed (creating the shadow if
   // necessary).
   void HandlePossibleShadowVisibilityChange(aura::Window* window);
 
   // Creates a new shadow for |window| and stores it in |window_shadows_|.  The
-  // shadow's visibility, bounds, and stacking are initialized appropriately.
+  // shadow's bounds are initialized and it is added to the window's layer.
   void CreateShadowForWindow(aura::Window* window);
 
-  // Stacks |shadow|'s layer directly beneath |window|'s layer.
-  void StackShadowBelowWindow(Shadow* shadow, aura::Window* window);
-
   WindowShadowMap window_shadows_;
 
   DISALLOW_COPY_AND_ASSIGN(ShadowController);
 };
 
 }  // namepsace aura_shell
 }  // namepsace internal
 
 #endif  // UI_AURA_SHELL_SHADOW_CONTROLLER_H_