[9] RFR for 8150724: [TEST] HiDPI: create a test for multiresolution icons

[Alexander Stepanov]

Hello,

Could you please review the following fix
http://cr.openjdk.java.net/~avstepan/8150724/webrev.00/
for
https://bugs.openjdk.java.net/browse/JDK-8150724 ?

Just a single test added.

Thanks,
Alexander