<AWT Dev> Review request for 8051617: Fullscreen mode is not working properly on Xorg

[Alexander Zvegintsev]

Hello,

please review the fix
http://cr.openjdk.java.net/~azvegint/jdk/9/8051617/00/
for the issue
https://bugs.openjdk.java.net/browse/JDK-8051617

Our logic for detecting top level window may fail on some window managers.
This fix passes this window directly.

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Thanks,
Alexander.