RFR: 8280392: java/awt/Focus/NonFocusableWindowTest/NonfocusableOwnerTest.java failed with "RuntimeException: Test failed." [v2]

[Alisen Chung]

> Introduce delays in test to stabilize. Test passes 50x after fix.

Alisen Chung has updated the pull request incrementally with one additional commit since the last revision:

  update copyright, fix jtreg formatting, update frame title, expand imports

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18091/files
  - new: https://git.openjdk.org/jdk/pull/18091/files/25008b78..5ba5eeba

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18091&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18091&range=00-01

  Stats: 35 lines in 1 file changed: 21 ins; 12 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/18091.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18091/head:pull/18091

PR: https://git.openjdk.org/jdk/pull/18091