This enables 21 tests in the texture department (including luminance
texture format tests except mimap related tests).

Bug:angleproject:2364

Change-Id: Ib609f0457833b34ecdb9d8f8b4479ece9ef6c1a6
Reviewed-on: https://chromium-review.googlesource.com/959233
Commit-Queue: Luc Ferron <lucferron@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>