Wrapping leaf nodes in non polymer elements

runtime/observatory/lib/src/models/repositories/notification.dart

+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file
+
+part of models;
+
+abstract class NotificationChangeEvent {
+  NotificationRepository get repository;
+}
+
+abstract class NotificationRepository {
+  Stream<NotificationChangeEvent> get onChange;
+  Iterable<Notification> list();
+  void delete(Notification);
+  void deleteAll();
+}