Initial implementation of new-style notification

ui/arc/notification/arc_notification_item.h

Index: ui/arc/notification/arc_notification_item.h
diff --git a/ui/arc/notification/arc_notification_item.h b/ui/arc/notification/arc_notification_item.h
index 5dac8956bbd917a0bfe6fee68bf95bef9355c9e7..397b32437682d271ed75f61313fd9a6e1e53bbfc 100644
--- a/ui/arc/notification/arc_notification_item.h
+++ b/ui/arc/notification/arc_notification_item.h
@@ -77,6 +77,8 @@ class ArcNotificationItem {
   virtual const std::string& GetNotificationKey() const = 0;
   // Returns the notification ID used in the Chrome message center.
   virtual const std::string& GetNotificationId() const = 0;
+  // Returnes the accessible name of the notification.
+  virtual const base::string16& GetAccessibleName() const = 0;
 };
 
 }  // namespace arc