Roll Observatory packages and add a roll script

packages/polymer/test/build/static_clean_test.dart

Index: packages/polymer/test/build/static_clean_test.dart
diff --git a/args/lib/args.dart b/packages/polymer/test/build/static_clean_test.dart
similarity index 53%
copy from args/lib/args.dart
copy to packages/polymer/test/build/static_clean_test.dart
index 562df446a83b70b2ee229a6567a2f7a09ddf0387..2fa62a9120f5cfa5efa6a4253e63f70014e8fb83 100644
--- a/args/lib/args.dart
+++ b/packages/polymer/test/build/static_clean_test.dart
@@ -2,8 +2,12 @@
 // 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;
+library polymer.test.build.static_clean_test;
 
-export 'src/arg_parser.dart';
-export 'src/arg_results.dart' hide newArgResults;
-export 'src/option.dart' hide newOption;
+import 'package:polymer/builder.dart';
+
+_unused() => build;
+
+void main() {
+  // Check that builder.dart is statically clean. Nothing to do.
+}