Roll Observatory packages and add a roll script

packages/analyzer/test/source/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.source;
+
+import 'package:unittest/unittest.dart';
+
+import '../utils.dart';
+import 'analysis_options_provider_test.dart' as analysis_options_provider_test;
+import 'package_map_provider_test.dart' as package_map_provider_test;
+import 'package_map_resolver_test.dart' as package_map_resolver_test;
+import 'path_filter_test.dart' as path_filter_test;
+import 'sdk_ext_test.dart' as sdk_ext_test;
+
+/// Utility for manually running all tests.
+main() {
+  initializeTestEnvironment();
+  group('source', () {
+    analysis_options_provider_test.main();
+    package_map_provider_test.main();
+    package_map_resolver_test.main();
+    sdk_ext_test.main();
+    path_filter_test.main();
+  });
+}