review: [JavaFX] Conditional support for GTK 3 on Linux

Kevin, Phil, https://bugs.openjdk.java.net/browse/JDK-8087516 [JavaFX] Conditional support for GTK 3 on Linux Here is the latest version of the changes. This addresses the issues raised by Kevin, as well as some other minor cleanups. This passes a FULL_TEST and Robot manual tests with GTK 2 & 3

review:

Kevin, please review this fix to update our handling of -Xpatch with tests and provide a @xpatch.args for general developement. https://bugs.openjdk.java.net/browse/JDK-8155862 http://cr.openjdk.java.net/~ddhill/8155862 -- David Hill Java Embe

[9] Code Review Request For 8155762: Encapsulate JavaFX impl_* implementation methods in transform package

Kevin and Jim, Please review the proposed fix: Webrev: https://bugs.openjdk.java.net/browse/JDK-8155762 JIRA: http://cr.openjdk.java.net/~ckyang/JDK-8155762/webrev.00/ Thanks, - Chien