Wrapping leaf nodes in non polymer elements

runtime/observatory/lib/src/mocks/objects/error.dart

Index: runtime/observatory/lib/src/mocks/objects/error.dart
diff --git a/runtime/observatory/lib/src/mocks/objects/error.dart b/runtime/observatory/lib/src/mocks/objects/error.dart
new file mode 100644
index 0000000000000000000000000000000000000000..f097ec941c9a4720bb5796b6f39e38d048502534
--- /dev/null
+++ b/runtime/observatory/lib/src/mocks/objects/error.dart
@@ -0,0 +1,20 @@
+// 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 ErrorRefMock implements M.ErrorRef {
+  final String id;
+  final M.ErrorKind kind;
+  final String message;
+  ErrorRefMock({this.id, this.kind, this.message});
+}
+
+class ErrorMock implements M.Error {
+  final String id;
+  final M.ErrorKind kind;
+  final String message;
+  final int size;
+  ErrorMock({this.id, this.kind, this.message, this.size: null});
+}