Support notifications with custom content

chrome/browser/notifications/notification_conversion_helper.cc

 // 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.
 
 #include "chrome/browser/notifications/notification_conversion_helper.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 184 matching lines @@
     message_center::NotificationType type) {
   switch (type) {
     case message_center::NOTIFICATION_TYPE_BASE_FORMAT:
       return "basic";
     case message_center::NOTIFICATION_TYPE_IMAGE:
       return "image";
     case message_center::NOTIFICATION_TYPE_MULTIPLE:
       return "list";
     case message_center::NOTIFICATION_TYPE_PROGRESS:
       return "progress";
+    case message_center::NOTIFICATION_TYPE_CUSTOM:
+      return "custom";
     default:
       NOTREACHED();
       return "";
   }
 }