Expose ASTC 2D on OpenGL Bug: angleproject:4372 Change-Id: Ic1800ac10b12547ca9816f7ad9dfd62f83f227c0 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2033066 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Kenneth Russell <kbr@chromium.org>