It crashes on Mesa.

BUG=angleproject:1188

Change-Id: I1e1e3e696bfda0c127b683a620cbaf302087e43b
Reviewed-on: https://chromium-review.googlesource.com/309630Tested-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>