[8u] RFR: JDK-8261867: Backport relevant test changes & additions from JDK-8130125

[Sergey Bylokhov]

On 23.03.2021 23:42, Andrew Hughes wrote:
> Yes, for some reason, I think I was under the delusion it was JDK code, not test code.
> As is, it's cleanup that was done for the modules system, but is applicable even before that.
> 
> I'm happy for your version to go in if you want to flag it with jdk8u-fix-request.

Just heads up, I see that a variety of tests updated to use the waitForIdle instead
of realsync, are you sure the fix for Robot.waitForIdle() was backported? In jdk 8u
the Robot.waitForIdle() was broken and this is why the realsync was used for testing.


-- 
Best regards, Sergey.