Implement async file API on top of isolates.

tests/standalone/src/DirectoryInvalidArgumentsTest.dart

Index: tests/standalone/src/DirectoryInvalidArgumentsTest.dart
diff --git a/tests/standalone/src/DirectoryInvalidArgumentsTest.dart b/tests/standalone/src/DirectoryInvalidArgumentsTest.dart
index 01d1bb005c9467e0445c0d9aeac617657ca8bc0b..2265685c250bd1e3244f7dcc909f4646066ffcbb 100644
--- a/tests/standalone/src/DirectoryInvalidArgumentsTest.dart
+++ b/tests/standalone/src/DirectoryInvalidArgumentsTest.dart
@@ -1,3 +1,7 @@
+// Copyright (c) 2011, 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.
+
 class DirectoryInvalidArgumentsTest {
   static void testFailingList(Directory d, var recursive) {
     int errors = 0;