<Swing Dev> [9] Review Request for 8056991: Provide OSInfo functionality to regression tests

[Yuri Nesterenko]

Colleagues,

please review this minimal change to fix
https://bugs.openjdk.java.net/browse/JDK-8056991

http://cr.openjdk.java.net/~yan/8056991/webrev.00

In the webrev there is an example of a test refactored.

We need to clean up regression tests from internal
dependencies. One of them, dependency on sun.awt.OSInfo.java, a
standard (however internal) tool to provide a version
of current OS.
Here, I'm just copying the file to a test helper directory.
(1) no swing library class depending on OSInfo will be affected
(2) no public API change occurs
A person updating sun.awt.OSInfo in future should, however,
duplicate changes in this test copy as well which is an ugly
compromise.

Thanks,
-yan