[8u20] Review request: RT-21702 - [Touch, Windows] MouseEvents generated from touch-screen action have isSynthesized() == false

[Chien Yang]

JIRA: https://javafx-jira.kenai.com/browse/RT-21702
Webrev: http://cr.openjdk.java.net/~ckyang/RT-21702/webrev.00/

Thanks,
- Chien