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.

@@ -21,10 +21,11 @@
  * questions.
  */
 
 /*
   @test
+  @key headful
   @bug 8129116
   @summary Deadlock with multimonitor fullscreen windows.
   @run main/timeout=20 MultimonDeadlockTest
  */
 import java.awt.*;