A clean backport to jfx27u. The patch fixes texture mapper issue and TextureMapperTest system test covers fix.
--------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - Backport caa8403b201ab027e5dbb5bb054f5ee3042e8928 Changes: https://git.openjdk.org/jfx27u/pull/9/files Webrev: https://webrevs.openjdk.org/?repo=jfx27u&pr=9&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8386859 Stats: 151 lines in 5 files changed: 148 ins; 2 del; 1 mod Patch: https://git.openjdk.org/jfx27u/pull/9.diff Fetch: git fetch https://git.openjdk.org/jfx27u.git pull/9/head:pull/9 PR: https://git.openjdk.org/jfx27u/pull/9
