[8u] RFR (T): 8242883: Incomplete backport of JDK-8078268: backport test part

[Ao Qi]

Hi all,

This is a 8u-specific bug. JDK-8078268 was backported to jdk8u, but
the backport is incomplete. An empty test were backported to jdk8u.

JBS: https://bugs.openjdk.java.net/browse/JDK-8242883
webrev: http://cr.openjdk.java.net/~aoqi/8242883/webrev.00/

before fix:
$ jtreg -dir:/home/aoqi/work/jdk8u-dev/jdk/test
javax/swing/text/html/parser/Parser/8078268/bug8078268.java
Error: Not a test or directory containing tests:
javax/swing/text/html/parser/Parser/8078268/bug8078268.java

after fix:
$ jtreg -dir:/home/aoqi/work/jdk8u-dev/jdk/test
javax/swing/text/html/parser/Parser/8078268/bug8078268.java
Test results: passed: 1

Thanks,
Ao Qi