Converted Observatory nav-notify element

runtime/observatory/lib/src/models/objects/error.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;
+
+enum ErrorKind {
+  /// The isolate has encountered an unhandled Dart exception.
+  UnhandledException,
+  /// The isolate has encountered a Dart language error in the program.
+  LanguageError,
+  /// The isolate has encounted an internal error. These errors should be
+  /// reported as bugs.
+  InternalError,
+  /// The isolate has been terminated by an external source.
+  TerminationError
+}
+
+abstract class ErrorRef extends ObjectRef {
+  String get id;
+  ErrorKind get kind;
+  String get message;
+}
+
+abstract class Error extends Object implements ErrorRef {
+
+}