RFR: 8296934: Write a test to verify whether Undecorated Frame can be iconified or not

[Anto J]

This test case verifies that Undecorated Frame can be iconified or not
Using mouse click events generated WINDOW_ACTIVATED, WINDOW_ICONIFIED, WINDOW_DEACTIVATED, and WINDOW_DEICONIFIED and tested whether it is iconified or not.

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

Commit messages:
 - 8296934: Write a test to verify whether Undecorated Frame can be iconified or not
 - 8296934: Write a test to verify whether Undecorated Frame can be iconified or not
 - 8296934: Write a test to verify whether Undecorated Frame can be iconified or not

Changes: https://git.openjdk.org/jdk/pull/11812/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11812&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8296934
  Stats: 188 lines in 1 file changed: 188 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/11812.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11812/head:pull/11812

PR: https://git.openjdk.org/jdk/pull/11812