Wrapping leaf nodes in non polymer elements

runtime/observatory/lib/mocks.dart

Index: runtime/observatory/lib/mocks.dart
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+// 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.
+
+library mocks;
+
+import 'dart:async';
+import 'package:observatory/models.dart' as M;
+
+part 'src/mocks/objects/error.dart';
+part 'src/mocks/objects/isolate.dart';
+part 'src/mocks/objects/script.dart';
+part 'src/mocks/objects/source_location.dart';
+
+part 'src/mocks/repositories/script.dart';