Add new flag for Notification Center features that are not ready yet.

ui/message_center/message_center_util.cc

 // Copyright (c) 2013 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.
 
 #include "ui/message_center/message_center_util.h"
 
 #include "base/command_line.h"
 #include "ui/message_center/message_center_switches.h"
 
 namespace message_center {
@@ skipping 13 matching lines @@
     return false;
   }
   if (CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableRichNotifications)) {
     return true;
   }
 
   return true;
 }
 
+bool IsExperimentalNotificationUIEnabled() {
+  return CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableExperimentalNotificationUI);
+}
+
 }  // namespace message_center