Add synchronous directory listing to dart:io Directory.

sdk/lib/io/directory_impl.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.
 
 part of dart.io;
 
 class _Directory implements Directory {
   static const CREATE_REQUEST = 0;
   static const DELETE_REQUEST = 1;
   static const EXISTS_REQUEST = 2;
   static const CREATE_TEMP_REQUEST = 3;
   static const LIST_REQUEST = 4;
   static const RENAME_REQUEST = 5;
 
   static const SUCCESS_RESPONSE = 0;
   static const ILLEGAL_ARGUMENT_RESPONSE = 1;
   static const OSERROR_RESPONSE = 2;
 
   _Directory(String this._path);
   _Directory.fromPath(Path path) : this(path.toNativePath());
   _Directory.current() : this(_current());
 
   external static String _current();
   external static _createTemp(String template);
   external static int _exists(String path);
   external static _create(String path);
   external static _delete(String path, bool recursive);
   external static _rename(String path, String newPath);
+  external static List _list(String path, bool recursive);
   external static SendPort _newServicePort();
 
   Future<bool> exists() {
     _ensureDirectoryService();
     List request = new List(2);
     request[0] = EXISTS_REQUEST;
     request[1] = _path;
     return _directoryService.call(request).transform((response) {
       if (_isErrorResponse(response)) {
         throw _exceptionOrErrorFromResponse(response, "Exists failed");
@@ skipping 183 matching lines @@
     if (result is OSError) {
       throw new DirectoryIOException("Rename failed", _path, result);
     }
     return new Directory(newPath);
   }
 
   DirectoryLister list({bool recursive: false}) {
     return new _DirectoryLister(_path, recursive);
   }
 
+  List listSync({bool recursive: false}) {
+    if (_path is! String || recursive is! bool) {
+      throw new ArgumentError();
+    }
+    return _list(_path, recursive);
+  }
+
   String get path => _path;
 
   String toString() => "Directory: '$path'";
 
   bool _isErrorResponse(response) {
     return response is List && response[0] != _SUCCESS_RESPONSE;
   }
 
   _exceptionOrErrorFromResponse(response, String message) {
     assert(_isErrorResponse(response));
@@ skipping 101 matching lines @@
     } else {
       throw e;
     }
   }
 
   Function _onDir;
   Function _onFile;
   Function _onDone;
   Function _onError;
 }