These tests generate native GL errors because ETC formats are not supported.
The test does not verify the data so it previously passed.

BUG=angleproject:3853

Change-Id: I21ed60f46031fe9fdc3a38c6a9a1e9197c56a5eb
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1774471
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>