test/java/awt/FullScreen/MultimonFullscreenTest/MultimonDeadlockTest.java

rev 14031 : 8159690: [TESTBUG] Mark headful tests with @key headful.

Backport of 14851:980da45565c8 from jdk9.  542/842 hunks applied directly from
the patch. 44 I resolved manually.  The remaining hunks are for filenames that
do not exist in jdk8u.

*** 21,30 ****
--- 21,31 ----
   * questions.
   */
  
  /*
    @test
+   @key headful
    @bug 8129116
    @summary Deadlock with multimonitor fullscreen windows.
    @run main/timeout=20 MultimonDeadlockTest
   */
  import java.awt.*;