This fixes assertion failures and other errors, reproducible by running the dEQP Texture Format tests. BUG=angle:813 Change-Id: I3b97f89323f9656b45f617211fb4579a24013951 Reviewed-on: https://chromium-review.googlesource.com/229351Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
