Roll Observatory packages and add a roll script

packages/intl/test/date_time_format_uninitialized_test.dart

Index: packages/intl/test/date_time_format_uninitialized_test.dart
diff --git a/packages/intl/test/date_time_format_uninitialized_test.dart b/packages/intl/test/date_time_format_uninitialized_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..d460c474829c8e27e96011eb5ee8d47104aec85d
--- /dev/null
+++ b/packages/intl/test/date_time_format_uninitialized_test.dart
@@ -0,0 +1,15 @@
+// Copyright (c) 2012, 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.
+
+/**
+ * Tests date formatting and parsing using locale data read from the
+ * local file system.
+ */
+library date_time_format_file_test;
+
+import 'date_time_format_test_core.dart';
+
+main() {
+  runDateTests(() => ['en_US']);
+}