Log use of RGB_888, which is currently not supported natively. Change-Id: Ia1c7bf07e296c4f12334061f1a8b6ba695fea937 Reviewed-on: https://swiftshader-review.googlesource.com/4035 Reviewed-by: Nicolas Capens <capn@google.com> Tested-by: Nicolas Capens <capn@google.com>