[jdk11u-dev] RFR: 8306714: Open source few Swing event and AbstractAction tests

[Andrew Lu]

I backport this for parity with 11.0.24-oracle.

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Commit messages:
 - Backport 31a73b0d7088d10a5ffb5541d66806a92b681ef9

Changes: https://git.openjdk.org/jdk11u-dev/pull/2636/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2636&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306714
  Stats: 329 lines in 6 files changed: 329 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2636.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2636/head:pull/2636

PR: https://git.openjdk.org/jdk11u-dev/pull/2636