RFR: 8306714: Open source few Swing event and AbstractAction tests

[Prasanta Sadhukhan]

This opensources few Swing event and AbstractAction tests

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Commit messages:
 - 8306714: Open source few Swing event and AbstractAction tests
 - 8306714: Open source few Swing event and AbstractAction tests

Changes: https://git.openjdk.org/jdk/pull/13608/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13608&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/jdk/pull/13608.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13608/head:pull/13608

PR: https://git.openjdk.org/jdk/pull/13608