Converted Observatory refs elements

runtime/observatory/tests/observatory_ui/mocks/objects/field.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 FieldRefMock implements M.FieldRef {
+  final String id;
+  final String name;
+  final M.ObjectRef dartOwner;
+  final M.InstanceRef declaredType;
+  final bool isConst;
+  final bool isFinal;
+  final bool isStatic;
+
+  const FieldRefMock({this.id: 'field-id', this.name: 'field-name',
+                      this.dartOwner,
+                      this.declaredType: const InstanceRefMock(name: 'dynamic'),
+                      this.isConst: false,
+                      this.isFinal: false, this.isStatic: false});
+}