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

pkg/polymer/test/property_change_test.dart

Index: pkg/polymer/test/property_change_test.dart
diff --git a/pkg/polymer/test/property_change_test.dart b/pkg/polymer/test/property_change_test.dart
index a8f0845db7c3e5190d027abd97f9508bc147f3f7..60d6c849c2bb2c6d81a646e038e6a9ccff26afca 100644
--- a/pkg/polymer/test/property_change_test.dart
+++ b/pkg/polymer/test/property_change_test.dart
@@ -5,6 +5,7 @@
 library polymer.test.property_change_test;
 
 import 'dart:async';
+import 'dart:html';
 import 'package:polymer/polymer.dart';
 import 'package:unittest/unittest.dart';
 import 'package:unittest/html_config.dart';
@@ -46,12 +47,11 @@ class XTest extends XBase {
   }
 }
 
-main() {
-  initPolymer();
+main() => initPolymer().run(() {
   useHtmlConfiguration();
 
   setUp(() => Polymer.onReady);
 
   test('bar change detected', () => _bar.future);
   test('zonk change detected', () => _zonk.future);
-}
+});