Made notification center notifications collapsed and expandable.

ui/message_center/message_center.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_MESSAGE_CENTER_H_
 #define UI_MESSAGE_CENTER_MESSAGE_CENTER_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 121 matching lines @@
   void SetNotificationImage(const std::string& notification_id,
                             const gfx::ImageSkia& image);
 
   void SetNotificationButtonIcon(const std::string& notification_id,
                                  int button_index,
                                  const gfx::ImageSkia& image);
 
   NotificationList* notification_list() { return notification_list_.get(); }
   bool quiet_mode() const { return notification_list_->quiet_mode(); }
 
-  // Overridden from NotificationList::Delegate.
+  // Overridden from NotificationList::Delegate:
   virtual void SendRemoveNotification(const std::string& id,
                                       bool by_user) OVERRIDE;
   virtual void SendRemoveAllNotifications(bool by_user) OVERRIDE;
   virtual void DisableNotificationByExtension(const std::string& id) OVERRIDE;
   virtual void DisableNotificationByUrl(const std::string& id) OVERRIDE;
   virtual void ShowNotificationSettings(const std::string& id) OVERRIDE;
   virtual void ShowNotificationSettingsDialog(gfx::NativeView context) OVERRIDE;
   virtual void OnNotificationClicked(const std::string& id) OVERRIDE;
-  virtual void OnQuietModeChanged(bool quiet_mode) OVERRIDE;
   virtual void OnButtonClicked(const std::string& id, int button_index)
       OVERRIDE;
-  virtual NotificationList* GetNotificationList() OVERRIDE;
+  virtual void OnExpand(const std::string& id) OVERRIDE;
+  virtual void OnQuietModeChanged(bool quiet_mode) OVERRIDE;

[dharcourt, 2013/03/01 10:17:31]

GetNotificationList() was removed from MessageCenter because it was removed from
NotificationList::Delegate (see notification_list.h comments for details). It is
not otherwise needed in MessageCenter because notification_list() can be used to
get the MessageCenter's NotificationList. OnQuietModeChanged() was moved to
group the On*Clicked() methods together.

 
  private:
   // Calls OnMessageCenterChanged on each observer.
   void NotifyMessageCenterChanged(bool new_notification);
 
   scoped_ptr<NotificationList> notification_list_;
   ObserverList<Observer> observer_list_;
   Delegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageCenter);
 };
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_MESSAGE_CENTER_H_