RFR: 8221451: PIT: sun/java2d/X11SurfaceData/SharedMemoryPixmapsTest/SharedMemoryPixmapsTest.sh fails

[Phil Race]

This test would fail with Xrender. But it did odd things like sleep in the paint method.
When I fixed that it started to pass every time.
It also had a problem listing for macOS supposedly for edge pixels.
I didn't see that myself but I changed it to not sample the edges.

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

Commit messages:
 - 8221451

Changes: https://git.openjdk.org/jdk/pull/27400/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27400&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8221451
  Stats: 100 lines in 3 files changed: 36 ins; 53 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/27400.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27400/head:pull/27400

PR: https://git.openjdk.org/jdk/pull/27400