Add support for the node net module.

frog/lib/node/vm.dart

+// 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.
+
+#library('vm');
+#import('node.dart');
+
+class vm native "require('vm')" {
+  static void runInThisContext(String code, [String filename]) native;
+  static void runInNewContext(String code, [var sandbox, String filename])
+    native;
+  static Script createScript(String code, [String filename]) native;
+  static Context createContext([sandbox]) native;
+  static runInContext(String code, Context context, [String filename]) native;
+}
+
+interface Context {}
+
+class Script native "vm.Script" {
+  void runInThisContext() native;
+  void runInNewContext([Map sandbox]) native;
+}
+