[polymer] interop with polymer-element and polymer.js

samples/third_party/todomvc/test/markdone_shadow_test.html

Index: samples/third_party/todomvc/test/markdone_shadow_test.html
diff --git a/samples/third_party/todomvc/test/markdone_shadow_test.html b/samples/third_party/todomvc/test/markdone_shadow_test.html
index 6dd9a7fc5f724774be46150f2e31eea13111b316..bccbd0ea85b6976613dcbf25aeecba26013b7147 100644
--- a/samples/third_party/todomvc/test/markdone_shadow_test.html
+++ b/samples/third_party/todomvc/test/markdone_shadow_test.html
@@ -11,9 +11,12 @@ BSD-style license that can be found in the LICENSE file.
   <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
   <script>
   // Force the ShadowDOM polyfill to run regardless of whether it is needed.
-  window.__forceShadowDomPolyfill = true;
+  window.Platform = window.Platform || {};
+  Platform.flags = Platform.flags || {};
+  Platform.flags.shadow = true;
   </script>
   <link rel="stylesheet" href="../web/app/app.css">
+  <link rel="import" href="packages/polymer/polymer.html">
   <link rel="import" href="../web/elements/td_model.html">
   <link rel="import" href="../web/elements/td_todos.html">
   <script src="packages/unittest/test_controller.js"></script>