Adding four bezel gestures

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 59 matching lines @@
       scoped_ptr<ImeControlDelegate> ime_control_delegate);
   void SetScreenshotDelegate(
       scoped_ptr<ScreenshotDelegate> screenshot_delegate);
   void SetVolumeControlDelegate(
       scoped_ptr<VolumeControlDelegate> volume_control_delegate);
 
   BrightnessControlDelegate* brightness_control_delegate() const {
     return brightness_control_delegate_.get();
   }
 
+  VolumeControlDelegate* volume_control_delegate() const {
+    return volume_control_delegate_.get();
+  }
+
  private:
   // Initializes the accelerators this class handles as a target.
   void Init();
 
   // Switches to a 0-indexed (in order of creation) window.
   // A negative index switches to the last window in the list.
   void SwitchToWindow(int window);
 
   scoped_ptr<ui::AcceleratorManager> accelerator_manager_;
 
@@ skipping 11 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_