<AWT Dev> [9] Review request: 8041987 [macosx] setDisplayMode crashes

[Petr Pchelko]

Hello, AWT Team.

Please review the fix for the issue:
https://bugs.openjdk.java.net/browse/JDK-8041987
The fix is available at:
http://cr.openjdk.java.net/~pchelko/9/8041987/

My recent fix with memory leak uncovered one more issue: in nativeSetDisplayMode the reference obtained outside of the block we use in the block.
That's fine for Objective-C pointers, because they are auto-retained and autoreleased in this case. But for core foundation types we need to retain/release
them manually. I've run all GraphicsDevice/GraphicsConfiguration/Fullscreen tests. I've also briefly skimmed the codebase for similar issues, but didn't find
any obvious problems of such kind.

Also I'm open-sourcing the tests which found the problem.

With best regards. Petr.