Roll Observatory packages and add a roll script

packages/polymer_expressions/test/all_tests.dart

Index: packages/polymer_expressions/test/all_tests.dart
diff --git a/packages/polymer_expressions/test/all_tests.dart b/packages/polymer_expressions/test/all_tests.dart
new file mode 100644
index 0000000000000000000000000000000000000000..dfe6a3a1728a8bb3e47d9714496420399bffcf13
--- /dev/null
+++ b/packages/polymer_expressions/test/all_tests.dart
@@ -0,0 +1,17 @@
+// 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 all_tests;
+
+import 'eval_test.dart' as eval;
+import 'parser_test.dart' as parser;
+import 'tokenizer_test.dart' as tokenizer;
+import 'visitor_test.dart' as visitor;
+
+main() {
+  eval.main();
+  parser.main();
+  tokenizer.main();
+  visitor.main();
+}