RFR: 8306280: Open source several choice AWT tests

[Alexander Zvegintsev]

Open sourcing few AWT choice tests.

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Commit messages:
 - initial

Changes: https://git.openjdk.org/jdk/pull/13521/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13521&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306280
  Stats: 435 lines in 4 files changed: 435 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13521.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13521/head:pull/13521

PR: https://git.openjdk.org/jdk/pull/13521