Ash: Support "Next Song", "Previous Song", "Play/Pause" Multi Media buttons

ash/accelerators/accelerator_table.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_TABLE_H_
 #define ASH_ACCELERATORS_ACCELERATOR_TABLE_H_
 
 #include "ash/ash_export.h"
 #include "ui/base/events.h"
 
@@ skipping 13 matching lines @@
   DISPLAY_TOGGLE_SCALE,
   EXIT,
   FOCUS_LAUNCHER,
   FOCUS_NEXT_PANE,
   FOCUS_PREVIOUS_PANE,
   FOCUS_SYSTEM_TRAY,
   KEYBOARD_BRIGHTNESS_DOWN,
   KEYBOARD_BRIGHTNESS_UP,
   MAGNIFY_SCREEN_ZOOM_IN,
   MAGNIFY_SCREEN_ZOOM_OUT,
+  MEDIA_NEXT_TRACK,
+  MEDIA_PLAY_PAUSE,
+  MEDIA_PREV_TRACK,
   NEW_INCOGNITO_WINDOW,
   NEW_TAB,
   NEW_WINDOW,
   NEXT_IME,
   OPEN_FEEDBACK_PAGE,
   PREVIOUS_IME,
   RESTORE_TAB,
   ROTATE_SCREEN,
   ROTATE_WINDOWS,
   SELECT_LAST_WIN,
@@ skipping 76 matching lines @@
 // Actions allowed while screen is locked (in addition to
 // kActionsAllowedAtLoginOrLockScreen).
 ASH_EXPORT extern const AcceleratorAction kActionsAllowedAtLockScreen[];
 
 // The number of elements in kActionsAllowedAtLockScreen.
 ASH_EXPORT extern const size_t kActionsAllowedAtLockScreenLength;
 
 }  // namespace ash
 
 #endif  // ASH_ACCELERATORS_ACCELERATOR_TABLE_H_