Converted Observatory nav-notify element

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

Index: runtime/observatory/lib/src/models/objects/notification.dart
diff --git a/runtime/observatory/lib/src/models/objects/notification.dart b/runtime/observatory/lib/src/models/objects/notification.dart
new file mode 100644
index 0000000000000000000000000000000000000000..9a9f8afbfd4d631792674909a53e37a5889b218c
--- /dev/null
+++ b/runtime/observatory/lib/src/models/objects/notification.dart
@@ -0,0 +1,17 @@
+// 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 Notification {}
+
+abstract class ExceptionNotification implements Notification{
+  Exception get exception;
+  /// [optional]
+  StackTrace get stacktrace;
+}
+
+abstract class EventNotification implements Notification{
+  Event get event;
+}