make StackingClient dispatch to either ash or desktop

chrome/browser/ui/ash/chrome_shell_delegate.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 CHROME_BROWSER_UI_ASH_CHROME_SHELL_DELEGATE_H_
 #define CHROME_BROWSER_UI_ASH_CHROME_SHELL_DELEGATE_H_
 
 #include "ash/launcher/launcher_types.h"
 #include "ash/shell_delegate.h"
 #include "base/basictypes.h"
@@ skipping 55 matching lines @@
   virtual aura::client::UserActionClient* CreateUserActionClient() OVERRIDE;
   virtual void OpenFeedbackPage() OVERRIDE;
   virtual void RecordUserMetricsAction(ash::UserMetricsAction action) OVERRIDE;
   virtual void HandleMediaNextTrack() OVERRIDE;
   virtual void HandleMediaPlayPause() OVERRIDE;
   virtual void HandleMediaPrevTrack() OVERRIDE;
   virtual string16 GetTimeRemainingString(base::TimeDelta delta) OVERRIDE;
   virtual void SaveScreenMagnifierScale(double scale) OVERRIDE;
   virtual double GetSavedScreenMagnifierScale() OVERRIDE;
   virtual ui::MenuModel* CreateContextMenu(aura::RootWindow* root) OVERRIDE;
+  virtual aura::client::StackingClient* CreateStackingClient() OVERRIDE;
 
   // content::NotificationObserver override:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
  private:
   static ChromeShellDelegate* instance_;
 
   content::NotificationRegistrar registrar_;
 
   scoped_ptr<ash::WindowPositioner> window_positioner_;
 
   base::WeakPtrFactory<ChromeShellDelegate> weak_factory_;
 
   ChromeLauncherController* launcher_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeShellDelegate);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_CHROME_SHELL_DELEGATE_H_