[8u] RFR: 8160974: [TESTBUG] Mark more headful tests with @key headful.

[Jonathan Dowland]

Hello,

Please review this backport of JDK-8160974 to 8u, for parity with
Oracle 8u271.

Bug: https://bugs.openjdk.java.net/browse/JDK-8160974
jdk9 patch: http://hg.openjdk.java.net/jdk9/jdk9/jdk/rev/fe58d505fffd

webrev:
    https://jmtd.net/tmp/JDK-8160974/

228/596 hunks apply without modifications. 16 hunks required manual
rework. The remainder were for files not present in jdk8u.  Those files
were:
    https://jmtd.net/tmp/JDK-8160974/files_not_present_in_jdk8u.txt


Thank you,

-- 
���� Jonathan Dowland <jdowland at redhat.com>
Senior Software Engineer, OpenJDK, Red Hat