Add synchronous directory listing to dart:io Directory.

tests/standalone/io/directory_fuzz_test.dart

 // 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.
 
 // 'fuzz' test the directory APIs by providing unexpected type
 // arguments. The test passes if the VM does not crash.
 
 import "dart:io";
 import "dart:isolate";
 
 import "fuzz_support.dart";
 
 fuzzSyncMethods() {
   typeMapping.forEach((k, v) {
     doItSync(() {
       var d = new Directory(v);
       doItSync(d.existsSync);
       doItSync(d.createSync);
       doItSync(d.deleteSync);
+      doItSync(d.listSync);
       doItSync(() {
         d.createTempSync().deleteSync();
       });
       doItSync(() {
         // Let's be a little careful. If the directory exists we don't
         // want to delete it and all its contents.
         if (!d.existsSync()) d.deleteSync(recursive: true);
       });
       typeMapping.forEach((k2, v2) {
         doItSync(() => d.renameSync(v2));
+        doItSync(() => d.listSync(recursive: v2));
         doItSync(() => d.list(recursive: v2).onError = (e) => null);
       });
     });
   });
 }
 
 fuzzAsyncMethods() {
   var port = new ReceivePort();
   var futures = [];
   typeMapping.forEach((k, v) {
@@ skipping 16 matching lines @@
       futures.add(doItAsync(() => d.rename(v2)));
     });
   });
   Futures.wait(futures).then((ignore) => port.close());
 }
 
 main() {
   fuzzSyncMethods();
   fuzzAsyncMethods();
 }