Updating Shadow DOM and including some fixes to enable it to work with CustomElements.

pkg/polymer/test/event_path_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.
 
 library polymer.test.web.event_path_test;
 
 import 'dart:html';
 import 'dart:async';
 import 'package:unittest/unittest.dart';
 import 'package:unittest/html_config.dart';
 
 main() {
   useHtmlConfiguration();
   test('bubbling in the right order', () {
     // TODO(sigmund): this should change once we port over the
     // 'WebComponentsReady' event.
-    runAsync(expectAsync0(() {
+    return new Future.delayed(Duration.ZERO).then((_) {
       var item1 = query('#item1');
       var menuButton = query('#menuButton');
       // Note: polymer uses automatic node finding (menuButton.$.menu)
       // also note that their node finding code also reachs into the ids
       // from the parent shadow (menu.$.selectorContent instead of
       // menu.$.menuShadow.$.selectorContent)
       var menu = menuButton.shadowRoot.query('#menu');
-      var selector = menu.shadowRoot.query("#menuShadow");
       var overlay = menuButton.shadowRoot.query('#overlay');
       var expectedPath = <Node>[
           item1,
           menuButton.shadowRoot.query('#menuButtonContent'),
-          selector.olderShadowRoot.query('#selectorContent'),
-          selector.olderShadowRoot.query('#selectorDiv'),
-          menu.shadowRoot.query('#menuShadow').olderShadowRoot,
+          menu.shadowRoot.olderShadowRoot.query('#selectorContent'),
+          menu.shadowRoot.olderShadowRoot.query('#selectorDiv'),
+          menu.shadowRoot.olderShadowRoot,
           menu.shadowRoot.query('#menuShadow'),
           menu.shadowRoot.query('#menuDiv'),
           menu.shadowRoot,
           menu,
           menuButton.shadowRoot.query('#menuButtonDiv'),
           // TODO(sigmund): this test is currently broken because currently
           // registerElement is sensitive to the order in which each custom
           // element is registered. When fixed, we should be able to add the
           // following three targets:
           //   overlay.shadowRoot.query('#overlayContent'),
           //   overlay.shadowRoot,
           //   overlay,
           menuButton.shadowRoot,
           menuButton
       ];
       var x = 0;
       for (int i = 0; i < expectedPath.length; i++) {
         var node = expectedPath[i];
         expect(node, isNotNull, reason: "Should not be null at $i");
         node.on['x'].listen(expectAsync1((e) {
           expect(e.currentTarget, node);
           expect(x++, i);
         }));
       }
 
       item1.dispatchEvent(new Event('x', canBubble: true));
-    }));
+    });
   });
 }