[jdk11u-dev] RFR: 8316285: Opensource JButton manual tests

[Andrew Lu]

I backport this for parity with 11.0.25-oracle.

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Commit messages:
 - Backport 9f5d2b947f7d70babba663e16882e480b8a973f2

Changes: https://git.openjdk.org/jdk11u-dev/pull/2905/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2905&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316285
  Stats: 292 lines in 3 files changed: 292 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2905.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2905/head:pull/2905

PR: https://git.openjdk.org/jdk11u-dev/pull/2905