Use a pool of native ports for directory operations

tests/standalone/src/ManyDirectoryOperationsTest.dart

Index: tests/standalone/src/ManyDirectoryOperationsTest.dart
diff --git a/tests/standalone/src/ManyDirectoryOperationsTest.dart b/tests/standalone/src/ManyDirectoryOperationsTest.dart
new file mode 100644
index 0000000000000000000000000000000000000000..d13c7f6725b404486242ddcdba936882246065cb
--- /dev/null
+++ b/tests/standalone/src/ManyDirectoryOperationsTest.dart
@@ -0,0 +1,14 @@
+// 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.
+//
+// Dart test program for testing using a lot of native port operations.
+
+#import("dart:io");
+
+main() {
+  for (var i = 0; i < 10000; i++) {
+    Directory d = new Directory(".");
+    d.exists((result) => null);
+  }
+}