test/java/awt/Window/WindowGCInFullScreen/WindowGCInFullScreen.java

rev 14031 : 8160974: [TESTBUG] Mark more headful tests with @key headful.

This is a backport of fe58d505fffd from jdk9. 228/596 hunks apply without
modifications. 16 hunks required manual rework. The remainder were for files
not present in jdk8u.

@@ -30,10 +30,11 @@
 
 import javax.swing.SwingUtilities;
 
 /**
  * @test
+ * @key headful
  * @bug 8019591
  * @author Sergey Bylokhov
  */
 public class WindowGCInFullScreen {