Review request for JDK-8139905: Add a convenience AccessControlContext factory

[Attila Szegedi]

Please review JDK-8139905 "Add a convenience AccessControlContext factory" at 
<http://cr.openjdk.java.net/~attila/8139905/webrev.jdk9> for 
<https://bugs.openjdk.java.net/browse/JDK-8139905>

Thanks,
  Attila.