Made --enable-rich-notifications flag available to message_center.

ui/message_center/message_center_switches.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 UI_MESSAGE_CENTER_MESSAGE_CENTER_SWITCHES_H_
 #define UI_MESSAGE_CENTER_MESSAGE_CENTER_SWITCHES_H_
 
 #include "ui/message_center/message_center_export.h"
 
 namespace message_center {
 namespace switches {
 
 // Disables the new design of message center, which shows each notification as a
 // card.
 // TODO(mukai): Remove this flag when we don't need to provide both of designs
 // anymore (i.e. the new design becomes default and no one complains about it).
 // Note that some classes should be removed and renamed as the result of
 // removing this class.
 // Affected class list:
 //  - WebNotificationButtonView2: remove '2' suffix and replace the old one.
 //  - WebNotificationButtonViewBase: merge into WebNotificationButtonView.
 MESSAGE_CENTER_EXPORT extern const char kDisableNewMessageCenterBubble[];
 
+// Enables rich templated notifications and NotificationCenter.
+MESSAGE_CENTER_EXPORT extern const char kEnableRichNotifications[];
+
+// Enables simple notifications with the new templates defined as part of rich
+// notifications. When kEnableRichNotifications is set those templates will be
+// used regardless of whether this flag is set, but this flag allows us to get
+// the new templates even when kEnableRichNotifications is not set. This is
+// useful for now because the kEnableRichNotifications functionality isn't
+// complete. TODO(dharcourt): Remove when kEnableRichNotifications is ready.
+MESSAGE_CENTER_EXPORT extern const char kEnableNewSimpleNotifications[];
+
 }  // namespace switches
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_MESSAGE_CENTER_CONSTANTS_H_