8132299: Shift + Mouse wheel ScrollPane horizontal scrolling doesn't work on Linux but works on Mac.
Reviewed-by: arapte, azvegint

8160974: [TESTBUG] Mark more headful tests with @key headful.
Reviewed-by: serb, simonis

8155742: [Windows] robot.keyPress(KeyEvent.VK_ALT_GRAPH) throws java.lang.IllegalArgumentException in windows
Reviewed-by: rchamyal, serb

8039279: Move awt tests to openjdk repository
Reviewed-by: pchelko, alexsch
Contributed-by: Dmitriy Ermashov <dmitriy.ermashov@oracle.com>