Implement patch records to patch canonical objects.

tests/language/issue23244_test.dart

Index: tests/language/issue23244_test.dart
diff --git a/tests/language/issue23244_test.dart b/tests/language/issue23244_test.dart
index da25452ac53070efa4f71473a2c3ae1650e23359..b15576995c17c5b26fa80fa98ba1e59fcdef9f83 100644
--- a/tests/language/issue23244_test.dart
+++ b/tests/language/issue23244_test.dart
@@ -1,3 +1,8 @@
+// Copyright (c) 2013, 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.
+
+// Regression test case for http://dartbug.com/23244
 import 'dart:async';
 import 'dart:isolate';