update to polymer js 0.5.1

pkg/polymer/test/import_test.dart

+// 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.
+
+import 'dart:async';
+import 'dart:html';
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+import 'package:polymer/polymer.dart';
+
+main() => initPolymer().run(() {
+  useHtmlConfiguration();
+
+  setUp(() => Polymer.onReady);
+
+  // **NOTE**: This test is currently being skipped everywhere until deferred
+  // imports have actual support.
+  test('Polymer.import', () {
+    return Polymer.import(['element_import/import_a.html']).then((_) {
+      expect((querySelector('x-foo') as dynamic).isCustom, true);
+      var dom = document.importNode(
+          (querySelector('#myTemplate') as TemplateElement).content, true);
+      return Polymer.importElements(dom).then((_) {
+        expect((querySelector('x-bar') as dynamic).isCustom, true);
+      });
+    });
+  });
+});
+