Support notifications with custom content

ui/message_center/notification_types.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_NOTIFICATION_TYPES_H_
 #define UI_MESSAGE_CENTER_NOTIFICATION_TYPES_H_
 
 #include "ui/message_center/message_center_export.h"
 
 namespace message_center {
@@ skipping 15 matching lines @@
 MESSAGE_CENTER_EXPORT extern const char kPrivateNeverTimeoutKey[];
 
 // Notification types. Note that the values in this enumeration are being
 // recoded in a histogram, updates should not change the entries' values.
 enum NotificationType {
   NOTIFICATION_TYPE_SIMPLE = 0,
   NOTIFICATION_TYPE_BASE_FORMAT = 1,
   NOTIFICATION_TYPE_IMAGE = 2,
   NOTIFICATION_TYPE_MULTIPLE = 3,
   NOTIFICATION_TYPE_PROGRESS = 4,  // Notification with progress bar.
+  NOTIFICATION_TYPE_CUSTOM = 5,
 
   // Add new values before this line.
   NOTIFICATION_TYPE_LAST = NOTIFICATION_TYPE_PROGRESS
 };
 
 enum NotificationPriority {
   MIN_PRIORITY = -2,
   LOW_PRIORITY = -1,
   DEFAULT_PRIORITY = 0,
   HIGH_PRIORITY = 1,
   MAX_PRIORITY = 2,
 
   // Top priority for system-level notifications.. This can't be set from
   // kPriorityKey, instead you have to call SetSystemPriority() of
   // Notification object.
   SYSTEM_PRIORITY = 3,
 };
 
 }  // namespace message_center
 
 #endif // UI_MESSAGE_CENTER_NOTIFICATION_TYPES_H_