Roll Observatory packages and add a roll script

packages/polymer/test/sort_registration_part2.dart

Index: packages/polymer/test/sort_registration_part2.dart
diff --git a/args/lib/args.dart b/packages/polymer/test/sort_registration_part2.dart
similarity index 61%
copy from args/lib/args.dart
copy to packages/polymer/test/sort_registration_part2.dart
index 562df446a83b70b2ee229a6567a2f7a09ddf0387..7b423e5c7c977858bcedafb919f40c7cb87d42c9 100644
--- a/args/lib/args.dart
+++ b/packages/polymer/test/sort_registration_part2.dart
@@ -2,8 +2,9 @@
 // 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 args;
+part of polymer.test.sort_registration_test;
 
-export 'src/arg_parser.dart';
-export 'src/arg_results.dart' hide newArgResults;
-export 'src/option.dart' hide newOption;
+@CustomTag('x-c')
+class C extends B {
+  C.created() : super.created();
+}