BUG=angleproject:891

Change-Id: Ic36d549d1a5ae52c49185064c2fdf60bd0074c0d
Reviewed-on: https://chromium-review.googlesource.com/299723Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Corentin Wallez <cwallez@chromium.org>