Roll Observatory packages and add a roll script

packages/web_components/test/custom_element_proxy_test.dart

+// Copyright (c) 2015, 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 custom_element_proxy_test;
+
+import 'dart:async';
+import 'dart:html';
+import 'dart:js';
+import 'package:unittest/html_config.dart';
+import 'package:unittest/unittest.dart';
+import 'package:web_components/web_components.dart';
+
+@CustomElementProxy('basic-element')
+class BasicElement extends HtmlElement {
+  BasicElement.created() : super.created();
+
+  factory BasicElement() => document.createElement('basic-element');
+
+  bool get isBasicElement =>
+      new JsObject.fromBrowserObject(this)['isBasicElement'];
+}
+
+@CustomElementProxy('extended-element', extendsTag: 'input')
+class ExtendedElement extends InputElement {
+  ExtendedElement.created() : super.created();
+
+  factory ExtendedElement() =>
+      document.createElement('input', 'extended-element');
+
+  bool get isExtendedElement =>
+      new JsObject.fromBrowserObject(this)['isExtendedElement'];
+}
+
+main() {
+  useHtmlConfiguration();
+  initWebComponents().then((_) {
+    var container = querySelector('#container') as DivElement;
+
+    tearDown(() {
+      container.children.clear();
+    });
+
+    test('basic custom element', () {
+      container.append(new BasicElement());
+      container.appendHtml('<basic-element></basic_element>');
+      // TODO(jakemac): after appendHtml elements are upgraded asynchronously,
+      // why? https://github.com/dart-lang/web-components/issues/4
+      return new Future(() {}).then((_) {
+        var elements = container.querySelectorAll('basic-element');
+        expect(elements.length, 2);
+        for (BasicElement element in elements) {
+          print(element.outerHtml);
+          print(element.runtimeType);
+          expect(element.isBasicElement, isTrue);
+        }
+      });
+    });
+
+    test('extends custom element', () {
+      container.append(new ExtendedElement());
+      container.appendHtml('<input is="extended-element" />');
+      // TODO(jakemac): after appendHtml elements are upgraded asynchronously,
+      // why? https://github.com/dart-lang/web-components/issues/4
+      return new Future(() {}).then((_) {
+        var elements = container.querySelectorAll('input');
+        expect(elements.length, 2);
+        for (ExtendedElement element in elements) {
+          expect(element.isExtendedElement, isTrue);
+        }
+      });
+    });
+  });
+}