Sends Updated when message center is closed.

ui/message_center/notification_list.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_LIST_H_
 #define UI_MESSAGE_CENTER_NOTIFICATION_LIST_H_
 
 #include <set>
 #include <string>
 
@@ skipping 31 matching lines @@
   // Notification Center.
   typedef std::set<Notification*, ComparePriorityTimestampSerial> Notifications;
 
   // Auto-sorted set used to return the Notifications to be shown as popup
   // toasts.
   typedef std::set<Notification*, CompareTimestampSerial> PopupNotifications;
 
   explicit NotificationList();
   virtual ~NotificationList();
 
-  // Affects whether or not a message has been "read".
-  void SetMessageCenterVisible(bool visible);
+  // Affects whether or not a message has been "read". Collects the set of
+  // ids whose state have changed and set to |udpated_ids|. NULL if updated
+  // ids don't matter.
+  void SetMessageCenterVisible(bool visible,
+                               std::set<std::string>* updated_ids);
 
   void AddNotification(NotificationType type,
                        const std::string& id,
                        const string16& title,
                        const string16& message,
                        const string16& display_source,
                        const std::string& extension_id,
                        const base::DictionaryValue* optional_fields);
 
   void UpdateNotificationMessage(const std::string& old_id,
@@ skipping 82 matching lines @@
   size_t unread_count_;
   bool quiet_mode_;
   scoped_ptr<base::OneShotTimer<NotificationList> > quiet_mode_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(NotificationList);
 };
 
 }  // namespace message_center
 
 #endif // UI_MESSAGE_CENTER_NOTIFICATION_LIST_H_