RFR: 8306755: Open source few Swing JComponent and AbstractButton tests

[Prasanta Sadhukhan]

This opensources few swing JComponent and AbstractButton tests

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Commit messages:
 - 8306755: Open source few Swing JComponent and AbstractButton tests

Changes: https://git.openjdk.org/jdk/pull/13651/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13651&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/jdk/pull/13651.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13651/head:pull/13651

PR: https://git.openjdk.org/jdk/pull/13651