[TEST_BUG] [macosx] For 2D_FullScreen/FullScrnFlipPriorTest test gray full screen displays without graphics, image and can't exit

Testsuite name: 2D Functional
Test name(s): 2D_FullScreen/FullScrnFlipPriorTest
Product(s) tested: JDK 8 u102 b14(64bit)
OS/architecture: MAC10.12 x64/Graphics:Intel HD Graphics 4000
   

Case Instruction:
1.Check Simple FullScreen is displayed with flipping strategy for all the GCs available
Wait till the FullScreen in repeated for all GC value.

2.Check BACKGROUND flip content for accelerated and non-accelerated images
The contents cleared to the component's background color after a flip which is white color
The contents cleared to the component's background color again after a flip which is again a white color
Three times Full Screen Will Appear,last 2 times it will be White Color with Text
The test will repeat for accelerated and non-accelerated images.

3.This will test the COPIED flip content for accelerated and non-accelerated images.
Volatile Image will be displayed First.
Content of BackBuffer will be displayed which is same as Volatile Image
(The contents is identical to the contents just pushed to the
Content of BackBuffer will be displayed again which is same as Volatile Image
front buffer after a flip)
The test will for repeat accelerated and non-accelerated images.

4.This will test the PRIOR flip content for accelerated and non-accelerated images
Volatile Image will be displayed First
Cotent of BackBuffer will be displayed which should be any clear color (white, grey, or black sometimes).
(The contents is the contents of the front buffer just before the flip)
Content of BackBuffer will be displayed again this time VolatileImage will be Displayed
(The contents is the contents of the front buffer just before the flip)
The test will for repeat accelerated and non-accelerated images.



Actual behavior:
Step4:After clicking 'startTest' button, gray full screen displays without graphics, image and can't exit. We use ESC exit to do next test case.