Changes the OnClick behavior in message center.

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 <list>
 #include <map>
 #include <string>
@@ skipping 131 matching lines @@
   // means that all notifications have been shown).
   bool HasPopupNotifications();
 
   // Modifies |notifications| to contain the |kMaxVisiblePopupNotifications|
   // least recent notifications that have not been shown as a popup.
   void GetPopupNotifications(Notifications* notifications);
 
   // Marks the popups for the |priority| as shown.
   void MarkPopupsAsShown(int priority);
 
+  // Marks a specific popup item as shown.
+  void MarkSinglePopupAsShown(const std::string& id);
+
   bool quiet_mode() const { return quiet_mode_; }
 
   // Sets the current quiet mode status to |quiet_mode|. The new status is not
   // expired.
   void SetQuietMode(bool quiet_mode);
 
   // Sets the current quiet mode to true. The quiet mode will expire in the
   // specified time-delta from now.
   void EnterQuietModeWithExpire(const base::TimeDelta& expires_in);
 
@@ skipping 38 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_