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.

*** 21,30 ****
--- 21,31 ----
   * 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