[9] Code Review Request: 8144556: Add support to allow user specified rendering order

[Chien Yang]

Please review the proposed specification and implementation.

JIRA: https://bugs.openjdk.java.net/browse/JDK-8144556
Webrev: http://cr.openjdk.java.net/~ckyang/JDK-8144556/webrev.00/

- Chien