[9] Review request: JDK-8058870 Mac: JFXPanel deadlocks in jnlp mode

[Anton V. Tarasov]

Hello,

Please review a fix:
https://bugs.openjdk.java.net/browse/JDK-8058870
http://cr.openjdk.java.net/~ant/JDK-8058870/webrev.0

A deadlock has been revealed on MacOS X with JFXPanel involved in an app launched via JNLP. Find 
more details in jira, please.

Thanks,
Anton.