Roll Observatory packages and add a roll script

packages/polymer/test/sort_registration_part1.dart

Index: packages/polymer/test/sort_registration_part1.dart
diff --git a/packages/polymer/test/sort_registration_part1.dart b/packages/polymer/test/sort_registration_part1.dart
new file mode 100644
index 0000000000000000000000000000000000000000..b9f2497d8246954c2fd7a8b1e8c1a65c654e7f9a
--- /dev/null
+++ b/packages/polymer/test/sort_registration_part1.dart
@@ -0,0 +1,22 @@
+// 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.
+
+part of polymer.test.sort_registration_test;
+
+// D will be registered after B below.
+@CustomTag('x-d')
+class D extends B {
+  D.created() : super.created();
+}
+
+@CustomTag('x-b')
+class B extends A {
+  B.created() : super.created();
+}
+
+// C is declared in another file, but it will be registered after B and before E
+@CustomTag('x-e')
+class E extends C {
+  E.created() : super.created();
+}