[OpenJDK 2D-Dev] [14] RFR JDK-8233910:java/awt/ColorClass/AlphaColorTest.java is failing intermittently in nightly lnux-x64 system

[Prasanta Sadhukhan]

Hi All,

Please review a testfix for an issue seen to be failing intermittently 
in mach5 nightly linux system.

The test uses robot to pick color from a frame's midpoint and check if 
the alpha is blended properly with the color but it seems the color is 
picked from wrong point.

Proposed fix is to make the fraae undecorated and also call 
setLocationRelativeTo() to show the frame at the middle away from 
taskbar to avoid possible mis-pick of color.

mach5 job is run on all 3 platforms and link is present in JBS.

Bug: https://bugs.openjdk.java.net/browse/JDK-8233910

webrev: http://cr.openjdk.java.net/~psadhukhan/8233910/webrev.0/

Regards

Prasanta