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

[Alisen Chung]

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

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Commit messages:
 - added delays to stabilize test

Changes: https://git.openjdk.org/jdk/pull/18091/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18091&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8280392
  Stats: 9 lines in 2 files changed: 8 ins; 1 del; 0 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