Turn on Polymer TodoMVC tests on Dart buildbots

samples/third_party/todomvc/test/markdone_shadow_test.dart

Index: samples/third_party/todomvc/test/markdone_shadow_test.dart
diff --git a/utils/tests/testrunner/layout_tests/web/layout_test.dart b/samples/third_party/todomvc/test/markdone_shadow_test.dart
old mode 100755
new mode 100644
similarity index 52%
copy from utils/tests/testrunner/layout_tests/web/layout_test.dart
copy to samples/third_party/todomvc/test/markdone_shadow_test.dart
index eead227404a3b53faf70f6f9315c075f50d2f1d9..4f7c90ae71f90975c233c34ab7da61e0a57b30c5
--- a/utils/tests/testrunner/layout_tests/web/layout_test.dart
+++ b/samples/third_party/todomvc/test/markdone_shadow_test.dart
@@ -2,16 +2,11 @@
 // 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 testrunner_test;
+library todomvc.test.markdone_shadow_test;
 
+// We don't use this import, but it signals to the test framework that this is
+// a web test.
 import 'dart:html';
-import 'package:unittest/unittest.dart';
-
-main() {
-  test("layout", () {
-    var lbl = new LabelElement();
-    lbl.text = 'Hello Dart!';
-    document.body.nodes.add(lbl);
-  });
-}
+import 'markdone_test.dart' as markdone_test;
 
+main() => markdone_test.main();