Converted Observatory class-nav-menu element

runtime/observatory/lib/src/mocks/objects/class.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 ClassRefMock implements M.ClassRef {
+  final String id;
+  final String name;
+  ClassRefMock({this.id, this.name});
+}
+
+class ClassMock implements M.ClassRef {
+  final String id;
+  final String name;
+  final bool isAbstract;
+  final bool isConst;
+  final M.ClassRef superclass;
+  final Iterable<M.ClassRef> subclasses;
+  ClassMock({this.id, this.name, this.isAbstract, this.isConst,
+      this.superclass, this.subclasses});
+}