BUG=angleproject:970

Change-Id: I33120ec8121dc1265360fbbe61103e03e593af3f
Reviewed-on: https://chromium-review.googlesource.com/286550Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>