[jdk11u-dev] RFR: 8306755: Open source few Swing JComponent and AbstractButton tests

[Andrew Lu]

I backport this for parity with 11.0.24-oracle.

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Commit messages:
 - Backport f3e8bd1d1161772539f42405fc4fcb02259f5b66

Changes: https://git.openjdk.org/jdk11u-dev/pull/2529/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2529&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306755
  Stats: 576 lines in 5 files changed: 576 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2529.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2529/head:pull/2529

PR: https://git.openjdk.org/jdk11u-dev/pull/2529