[7u6] Request for approval for 7171163: [macosx] Shortcomings in the design of the secondary native event loop made JavaFX DnD deadlock

[Alexander Zuev]

Hello,

   requesting approval to push into the 7u6 workspace fix for

7171163: [macosx] Shortcomings in the design of the secondary native 
event loop made JavaFX DnD deadlock

   Fix were reviewed on macosx-port-dev public alias and were approved 
by Artem Ananiev
The fix for jdk8 will be slightly different so i'm going to update it 
and it will be reviewed and pushed a bit later.

Bug description can be found here: 
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7171163
Technical review thread: 
http://mail.openjdk.java.net/pipermail/macosx-port-dev/2012-May/004239.html
Webrev can be found here: 
http://cr.openjdk.java.net/~kizune/7171163/webrev.03