Roll Observatory packages and add a roll script

packages/initialize/test/parts/bar.dart

Index: packages/initialize/test/parts/bar.dart
diff --git a/web_components/lib/init.dart b/packages/initialize/test/parts/bar.dart
similarity index 56%
copy from web_components/lib/init.dart
copy to packages/initialize/test/parts/bar.dart
index 1ebb1413f9023f4113e1c1616511af98477037f5..4aa5f5c86485f8e41737de9b68796755b081aa52 100644
--- a/web_components/lib/init.dart
+++ b/packages/initialize/test/parts/bar.dart
@@ -1,9 +1,16 @@
 // 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 web_components.init;
+part of initialize.initializer_parts_test;
 
-import 'dart:async';
-import 'src/init.dart';
+@initializeTracker
+class Bar2 {}
 
-Future main() => initWebComponents();
+@initializeTracker
+class Bar {}
+
+@initializeTracker
+bar2() {}
+
+@initializeTracker
+bar() {}