RFR: 8315600: Open source few more headless Swing misc tests [v4]

[Prasanta Sadhukhan]

> Few more closed swing headless tests are opensourced

Prasanta Sadhukhan has updated the pull request incrementally with one additional commit since the last revision:

  Sort imports

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/15582/files
  - new: https://git.openjdk.org/jdk/pull/15582/files/fccec782..a1c72b8e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15582&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15582&range=02-03

  Stats: 7 lines in 2 files changed: 3 ins; 4 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15582.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15582/head:pull/15582

PR: https://git.openjdk.org/jdk/pull/15582