Wrapping leaf nodes in non polymer elements

runtime/observatory/lib/src/mocks/repositories/dump.dart

Index: runtime/observatory/lib/src/mocks/repositories/dump.dart
diff --git a/runtime/observatory/lib/src/mocks/repositories/dump.dart b/runtime/observatory/lib/src/mocks/repositories/dump.dart
new file mode 100644
index 0000000000000000000000000000000000000000..2e3f48bc986185010b9db3d3c615f2755c16949d
--- /dev/null
+++ b/runtime/observatory/lib/src/mocks/repositories/dump.dart
@@ -0,0 +1,15 @@
+// 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;
+
+typedef void DumpRepositoryMockCallback(Map);
+
+class DumpRepositoryMock implements M.DumpRepository {
+  final DumpRepositoryMockCallback wrapped;
+
+  void load(Map dump) => wrapped(dump);
+
+  DumpRepositoryMock(this.wrapped);
+}