Converted Observatory isolate-nav-menu element

runtime/observatory/lib/src/mocks/objects/isolate.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 mocks;
+
+class IsolateRefMock implements M.IsolateRef {
+  final String id;
+  final int number;
+  final String name;
+
+  IsolateRefMock({this.id, this.number, this.name});
+}
+
+class IsolateMock implements M.Isolate {
+  final String id;
+  final int number;
+  final String name;
+  final DateTime startTime;
+  final bool runnable;
+
+  IsolateMock({this.id, this.number, this.name, this.startTime, this.runnable});
+  // TODO(cbernaschina) add other properties.
+}