[jdk11u-dev] RFR: 8305943: Open source few AWT Focus related tests

[Andrew Lu]

I backport this for parity with 11.0.24-oracle.

-------------

Commit messages:
 - Backport 64ed816ad9f1a9773c9865a013e89b709a130e9c

Changes: https://git.openjdk.org/jdk11u-dev/pull/2637/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2637&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305943
  Stats: 765 lines in 5 files changed: 765 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2637.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2637/head:pull/2637

PR: https://git.openjdk.org/jdk11u-dev/pull/2637