Let Chrome app handle Ash accelerators first if the app is launched as a window

ash/accelerators/accelerator_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_ACCELERATORS_ACCELERATOR_CONTROLLER_H_
 #define ASH_ACCELERATORS_ACCELERATOR_CONTROLLER_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 38 matching lines @@
   void UnregisterAll(ui::AcceleratorTarget* target);
 
   // Activates the target associated with the specified accelerator.
   // First, AcceleratorPressed handler of the most recently registered target
   // is called, and if that handler processes the event (i.e. returns true),
   // this method immediately returns. If not, we do the same thing on the next
   // target, and so on.
   // Returns true if an accelerator was activated.
   bool Process(const ui::Accelerator& accelerator);
 
+  // Returns true if the |accelerator| is registered.
+  bool IsRegistered(const ui::Accelerator& accelerator) const;
+
   // Overridden from ui::AcceleratorTarget:
   virtual bool AcceleratorPressed(const ui::Accelerator& accelerator) OVERRIDE;
   virtual bool CanHandleAccelerators() const OVERRIDE;
 
   void SetBrightnessControlDelegate(
       scoped_ptr<BrightnessControlDelegate> brightness_control_delegate);
   void SetCapsLockDelegate(scoped_ptr<CapsLockDelegate> caps_lock_delegate);
   void SetImeControlDelegate(
       scoped_ptr<ImeControlDelegate> ime_control_delegate);
   void SetScreenshotDelegate(
@@ skipping 29 matching lines @@
 
   // Actions allowed when the user is not signed in or screen is locked
   std::set<int> actions_allowed_at_login_screen_;
 
   DISALLOW_COPY_AND_ASSIGN(AcceleratorController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_ACCELERATORS_ACCELERATOR_CONTROLLER_H_