Add support for cross-session storage

pkg/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 '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() {
   groupSep = ' | ';
   group('file_system', () {
     memory_file_system_test.main();
+    physical_resource_provider_test.main();
     resource_uri_resolver_test.main();
   });
 }