Hello.
Please review the fix for jdk/client.

Bug: https://bugs.openjdk.java.net/browse/JDK-8238936
Fix: http://cr.openjdk.java.net/~serb/8238936/webrev.00

Our Robot's peers have an incorrect assumption that all
graphics devices passed to the constructor are supports.

 - On windows, we simply ignore this device(even if the device
   is a custom not "real" device) because we know we can move
   the mouse on every screen.
 - On macOS, we cast this device to the internal graphics device
   and get ClassCastException.
 - On Linux, we try to access the passed graphics device and its
   config via JNI and get a crash.

In the fix we throw AWTException if the device is not of the
class of the real graphical device used by the AWT toolkit
+ small cleanup

--
Best regards, Sergey.

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