test/java/awt/Component/TreeLockDeadlock/TreeLockDeadlock.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.

@@ -28,10 +28,11 @@
 import static java.util.concurrent.TimeUnit.MINUTES;
 import static java.util.concurrent.TimeUnit.NANOSECONDS;
 
 /**
  * @test
+ * @key headful
  * @bug 8138764
  */
 public final class TreeLockDeadlock extends Frame {
 
     @Override