Add synchronous directory listing to dart:io Directory.

tests/standalone/io/directory_invalid_arguments_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.
 
 import "dart:io";
 
 class DirectoryInvalidArgumentsTest {
   static void testFailingList(Directory d, var recursive) {
     int errors = 0;
     var lister = d.list(recursive: recursive);
@@ skipping 21 matching lines @@
     } catch (e) {
       Expect.isTrue(e is ArgumentError);
     }
     try {
       d.createSync();
       Expect.fail("No exception thrown");
     } catch (e) {
       Expect.isTrue(e is ArgumentError);
     }
     testFailingList(d, false);
+    Expect.throws(() => d.listSync(recursive: true),
+                  (e) => e is ArgumentError);
     d = new Directory(".");
     testFailingList(d, 1);
+    Expect.throws(() => d.listSync(recursive: 1),
+                  (e) => e is ArgumentError);
   }
 
   static void testMain() {
     testInvalidArguments();
   }
 }
 
 main() {
   DirectoryInvalidArgumentsTest.testMain();
 }