test/java/awt/Robot/AcceptExtraMouseButtons/AcceptExtraMouseButtons.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.

@@ -21,10 +21,11 @@
  * questions.
  */
 
 /*
   @test %I% %E%
+  @key headful
   @bug 6315717
   @summary verifies that Robot is accepting extra mouse buttons
   @author Andrei Dmitriev : area=awt.mouse
   @library ../../regtesthelpers
   @build Util