[9] Code Review Request For 8157900: Encapsulate JavaFX impl_* implementation methods in Node (peer and dirty)

[Chien Yang]

Hi Kevin, Jonathon and Vadim,

Please review the proposed fix:
JIRA: https://bugs.openjdk.java.net/browse/JDK-8157900
Webrev: http://cr.openjdk.java.net/~ckyang/JDK-8157900/webrev.00/

PS: This is a huge webrev and touches many components. I believe most 
component owners would want to do a quick cursory review except those 
that I tagged.

Thanks,
- Chien