Roll Observatory packages and add a roll script

packages/polymer/example/component/news/test/news_index_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:html';
+import 'package:polymer/polymer.dart';
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+
+/// This test runs the news example and checks the state of the initial page.
+main() {
+  initPolymer();
+  useHtmlConfiguration();
+
+  extractLinks(nodes) => nodes
+      .where((n) => n is Element)
+      .map((n) => n.query('a').href.split('/').last)
+      .toList();
+
+  setUp(() => Polymer.onReady);
+
+  test('initial state', () {
+    final listComp = querySelector('ul');
+    final items = listComp.querySelectorAll('li');
+    expect(items.length, 6);
+    expect(extractLinks(items), ['1', '2', '3', '4', '4', '5']);
+    expect(listComp is Polymer, true, reason: 'x-news should be created');
+
+    final contents = listComp.shadowRoot.querySelectorAll('content');
+    expect(contents.length, 2, reason: 'news has 2 content tags');
+    expect(extractLinks(contents[0].getDistributedNodes()), ['3', '5'],
+        reason: 'breaking stories first');
+    expect(
+        extractLinks(contents[1].getDistributedNodes()), ['1', '2', '4', '4'],
+        reason: 'other stories after breaking stories');
+  });
+}