Add some tolerance to this test before failing and make it dump the images if it does fail.
------------- Commit messages: - 8341535 Changes: https://git.openjdk.org/jdk/pull/21363/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21363&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8341535 Stats: 25 lines in 1 file changed: 19 ins; 0 del; 6 mod Patch: https://git.openjdk.org/jdk/pull/21363.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/21363/head:pull/21363 PR: https://git.openjdk.org/jdk/pull/21363
