[jdk11u-dev] RFR: 8252825: Add automated test for fix done in JDK-8218479

[Aleksey Shipilev]

Clean backport.

Additional testing:
 - [x] New test passes on Linux/GTK3

-------------

Commit messages:
 - Backport 55c7e769c801f95f1c457fecdfbf07bace0a194f

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/235/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=235&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8252825
  Stats: 140 lines in 1 file changed: 140 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/235.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/235/head:pull/235

PR: https://git.openjdk.java.net/jdk11u-dev/pull/235