Sends updated event for click on notifications.

ui/message_center/views/message_popup_collection.h

Index: ui/message_center/views/message_popup_collection.h
diff --git a/ui/message_center/views/message_popup_collection.h b/ui/message_center/views/message_popup_collection.h
index 494941c44faf2f1afb4eb5f1b991812b9b64e6d6..5c48af00468e15a9f3792d56291320b7cec93b38 100644
--- a/ui/message_center/views/message_popup_collection.h
+++ b/ui/message_center/views/message_popup_collection.h
@@ -28,6 +28,7 @@ FORWARD_DECLARE_TEST(WebNotificationTrayTest, ManyPopupNotifications);
 namespace message_center {
 namespace test {
 class MessagePopupCollectionTest;
+class MessagePopupCollectionWidgetsTest;
 }
 
 class MessageCenter;
@@ -56,6 +57,7 @@ class MESSAGE_CENTER_EXPORT MessagePopupCollection
   FRIEND_TEST_ALL_PREFIXES(ash::WebNotificationTrayTest,
                            ManyPopupNotifications);
   friend class test::MessagePopupCollectionTest;
+  friend class test::MessagePopupCollectionWidgetsTest;
   typedef std::map<std::string, ToastContentsView*> ToastContainer;
 
   void CloseAllWidgets();
@@ -86,6 +88,7 @@ class MESSAGE_CENTER_EXPORT MessagePopupCollection
       const std::string& notification_id) OVERRIDE;
 
   void SetWorkAreaForTest(const gfx::Rect& work_area);
+  views::Widget* GetWidgetForId(const std::string& id);
 
   gfx::NativeView parent_;
   MessageCenter* message_center_;