- Move VM specific helpers to the common dart:io patch file.

runtime/bin/common_patch.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.
 
 patch class _IOCrypto {
   /* patch */ static Uint8List getRandomBytes(int count)
       native "Crypto_GetRandomBytes";
 }
+
+
+// Provide a closure which will allocate a Timer object to be able to hook
+// up the Timer interface in dart:isolate with the implementation here.
+_getTimerFactoryClosure() {
+  runTimerClosure = _Timer._handleTimeout;
+  return _Timer._factory;
+}