Roll Observatory packages and add a roll script

packages/analyzer/test/file_system/test_all.dart

+// Copyright (c) 2014, 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 test.file_system;
+
+import 'package:unittest/unittest.dart';
+
+import '../utils.dart';
+import 'memory_file_system_test.dart' as memory_file_system_test;
+import 'physical_resource_provider_test.dart'
+    as physical_resource_provider_test;
+import 'resource_uri_resolver_test.dart' as resource_uri_resolver_test;
+
+/// Utility for manually running all tests.
+main() {
+  initializeTestEnvironment();
+  group('file_system', () {
+    memory_file_system_test.main();
+    physical_resource_provider_test.main();
+    resource_uri_resolver_test.main();
+  });
+}