Chrome uses regular texture uploads on all platforms except OpenGL on
Mac to do robust resource init for textures because multiple bugs have
been observed with texture corruption.

BUG=883276
BUG=882580
BUG=941620

Change-Id: I5fcd6862147822a08c7533e6a6a9277223034ebd
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1669104Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>