test/java/awt/Focus/WindowIsFocusableAccessByThreadsTest/WindowIsFocusableAccessByThreadsTest.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      8047288
   @summary  Tests method isFocusable of Window component. It should be accessed only from EDT
   @author   artem.malinko@oracle.com
   @library  ../../regtesthelpers
   @build    Util