Aura: Add non-browser windows into the list of "Alt + Tab" cycle list.

ash/wm/activation_controller.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 ASH_WM_ACTIVATION_CONTROLLER_H_
 #define ASH_WM_ACTIVATION_CONTROLLER_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ skipping 22 matching lines @@
   // NULL if there is no event.
   static aura::Window* GetActivatableWindow(aura::Window* window,
                                             const aura::Event* event);
 
   // Overridden from aura::client::ActivationClient:
   virtual void ActivateWindow(aura::Window* window) OVERRIDE;
   virtual void DeactivateWindow(aura::Window* window) OVERRIDE;
   virtual aura::Window* GetActiveWindow() OVERRIDE;
   virtual bool OnWillFocusWindow(aura::Window* window,
                                  const aura::Event* event) OVERRIDE;
+  virtual bool CanActivateWindow(aura::Window* window) const OVERRIDE;
 
   // Overridden from aura::WindowObserver:
   virtual void OnWindowVisibilityChanged(aura::Window* window,
                                          bool visible) OVERRIDE;
   virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
 
   // Overridden from aura::EnvObserver:
   virtual void OnWindowInitialized(aura::Window* window) OVERRIDE;
 
   // Overridden from aura::RootWindowObserver:
@@ skipping 21 matching lines @@
   // change notifications causing activation.
   bool updating_activation_;
 
   DISALLOW_COPY_AND_ASSIGN(ActivationController);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_ACTIVATION_CONTROLLER_H_