Roll Observatory packages and add a roll script

packages/polymer/test/force_ready_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().then((zone) => zone.run(() {
+  useHtmlConfiguration();
+
+  setUp(() => window.on['HTMLImportsLoaded']);
+
+  /// We do not port the full test, since this just proxies through to the
+  /// polymer js implementation.
+  test('can force ready', () {
+    return new Future(() {}).then((_) {
+      expect(Polymer.waitingFor.length, 1);
+      expect(Polymer.waitingFor[0], querySelector('polymer-element'));
+      Polymer.forceReady();
+      return Polymer.onReady;
+    });
+  });
+}));