Made notification center notifications collapsed and expandable.

ui/message_center/message_center.h

Index: ui/message_center/message_center.h
diff --git a/ui/message_center/message_center.h b/ui/message_center/message_center.h
index 7cc49daa96344396bfcc59e742d36e94dcb0d252..6dd453260a4df0a275ceb4f098cd684f7a347d0f 100644
--- a/ui/message_center/message_center.h
+++ b/ui/message_center/message_center.h
@@ -139,7 +139,7 @@ class MESSAGE_CENTER_EXPORT MessageCenter : public NotificationList::Delegate {
   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;
@@ -148,10 +148,10 @@ class MESSAGE_CENTER_EXPORT MessageCenter : public NotificationList::Delegate {
   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.