[jdk11u-dev] RFR: 8305942: Open source several AWT Focus related tests

[Andrew Lu]

I backport this for parity with 11.0.24-oracle.

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Commit messages:
 - Backport 8346ae2bc1152f13bc77c643252d84e2043ffe0b

Changes: https://git.openjdk.org/jdk11u-dev/pull/2638/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2638&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305942
  Stats: 831 lines in 6 files changed: 831 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2638.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2638/head:pull/2638

PR: https://git.openjdk.org/jdk11u-dev/pull/2638