[8] Please review my fix for 7124247: [macosx] Implement GraphicsDevice.setDisplayMode()

[Alexander Zuev]

Hello,

   please review my fix for CR 7124247: [macosx] Implement 
GraphicsDevice.setDisplayMode()

   CR description can be found here: 
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7124247

   Webrev with the proposed change can be seen here: 
http://cr.openjdk.java.net/~kizune/7124247/jdk8/webrev.00

With best regards,
Alex