Initial implementation of new-style notification

ui/message_center/message_center_switches.h

 // Copyright 2014 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 UI_MESSAGE_CENTER_MESSAGE_CENTER_SWITCHES_H_
 #define UI_MESSAGE_CENTER_MESSAGE_CENTER_SWITCHES_H_
 
 #include "base/compiler_specific.h"
 #include "ui/message_center/message_center_export.h"
 
 namespace switches {
 
 MESSAGE_CENTER_EXPORT extern const char
     kEnableMessageCenterAlwaysScrollUpUponNotificationRemoval[];
 
 // Flag to enable or disable notification changes while the message center
 // opens.  Possible values are "" (meant default), "enabled" or "disabled".
 // This flag will be removed once the feature gets stable.
 MESSAGE_CENTER_EXPORT extern const char kMessageCenterChangesWhileOpen[];
 
+MESSAGE_CENTER_EXPORT extern const char
+    kEnableMessageCenterNewStyleNotification[];
+MESSAGE_CENTER_EXPORT extern const char
+    kDisableMessageCenterNewStyleNotification[];
+
 }  // namespace switches
 
 #endif  // UI_MESSAGE_CENTER_MESSAGE_CENTER_SWITCHES_H_