update our CustomElement+Shadow DOM patch

pkg/polymer/test/entered_view_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.entered_view_test;
+
+import 'dart:async';
+import 'dart:html';
+import 'package:polymer/polymer.dart';
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+import 'package:unittest/matcher.dart';
+
+@reflectable
+class XOuter extends PolymerElement {
+  @observable bool expand = false;
+
+  XOuter.created() : super.created();
+}
+
+@reflectable
+class XInner extends PolymerElement {
+  int enteredCount = 0;
+
+  XInner.created() : super.created();
+
+  enteredView() {
+    enteredCount++;
+    super.enteredView();
+  }
+}
+
+main() => initPolymer().run(_tests);
+
+_tests() {
+  useHtmlConfiguration();
+  Polymer.register('x-inner', XInner);
+  Polymer.register('x-outer', XOuter);
+
+  setUp(() => Polymer.onReady);
+
+  test('element created properly', () {
+    XOuter outer = query('x-outer');
+    outer.expand = true;
+    return outer.onMutation(outer.shadowRoot).then((_) {
+      // Element upgrade is also using mutation observers. Wait another tick so
+      // it goes before we do.
+      return new Future(() {
+        XInner inner = outer.shadowRoot.query('x-inner');
+        expect(inner.enteredCount, 1, reason: 'enteredView should be called');
+      });
+    });
+  });
+}