<AWT Dev> RFR: 8196019 java/awt/Window/Grab/GrabTest.java fails on Windows

[Sergey Bylokhov]

Hello.
Please review the fix for jdk/client.

Bug: https://bugs.openjdk.java.net/browse/JDK-8196019
Fix: http://cr.openjdk.java.net/~serb/8196019/webrev.00

Two issues were fixed:
  - On Windows, the mouse may click on the minimize/maximize buttons
    of the frame instead of title, when some non-default scale is set
    on the screen(But I was not able to reproduce this issue).
    As a possible solution the size of the windows are increased.

  - On macOS, the test shows and clicks on undecorated windows at the
    top left corner of the screen, and instead of the window may click
    on the Dock or global menubar. These windows are moved to the center
    of the screen.

-- 
Best regards, Sergey.