[9] Review request for 8176528: Progress state for window is not displayed in taskbar

[Alexander Zvegintsev]

Hello,

please review the fix
http://cr.openjdk.java.net/~azvegint/jdk/9/8176528/00/

for the issue

https://bugs.openjdk.java.net/browse/JDK-8176528

The test uses java.awt.Window which doesn't have button for its window 
in the taskbar, thus we can't show progress for this window there.



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Thanks,
Alexander.