Roll Observatory packages and add a roll script

packages/polymer/test/sort_registration_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.sort_registration_test;
+
+import 'dart:html';
+import 'package:polymer/polymer.dart';
+import 'package:unittest/html_config.dart';
+import 'package:unittest/unittest.dart';
+
+part 'sort_registration_part1.dart';
+part 'sort_registration_part2.dart';
+
+@CustomTag('x-a')
+class A extends PolymerElement {
+  A.created() : super.created();
+}
+
+main() => initPolymer().then((zone) => zone.run(() {
+  useHtmlConfiguration();
+  setUp(() => Polymer.onReady);
+
+  test('registration is done in the right order', () {
+    expect(querySelector('x-e') is E, isTrue);
+  });
+}));