BUG=angleproject:2051

Change-Id: I09e8548ef76b7d824743d06b0bba21633bc40a24
Reviewed-on: https://chromium-review.googlesource.com/523671
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>