[OpenJDK 2D-Dev] Review Request: (JDK-8007026) new test sun/java2d/OpenGL/CustomCompositeTest.java fails on solaris, linux, windows

[prasanta sadhukhan]

Hi,

It seems XRSurfaceData#getRaster and X11SurfaceData#getRaster was not 
implemented resulting in failure in CustomCompositeTest.
I tried implementing the same and the test is passing.
Could you please review the webrev?
Bug: https://bugs.openjdk.java.net/browse/JDK-8007026
webrev: http://cr.openjdk.java.net/~serb/prasanta/8007026/webrev.00

Regards
Prasanta