[8u-dev] Review request: RT-39797: Glass sometimes prints warning message on exit

[Morris Meyer]

Folks,

Could I get a review of these changes?  As Glass invokeLater is not 
thread-safe, and since the JNI native method 
MacApplication._submitForLaterInvocation() only adds the GlassRunnable 
when the event thread is still running and Java is still around, I'm 
dealing with this extraneous GlassRunnable in a similar manner as RT-39688.

Thanks,

        --morris

WEBREV - http://cr.openjdk.java.net/~morris/RT-39797.01a
JIRA - https://javafx-jira.kenai.com/browse/RT-39797