BUG=angleproject:520

Change-Id: I6f19ca160214a44c75619c320d5e1db7e4098eda
Reviewed-on: https://chromium-review.googlesource.com/317540
Tryjob-Request: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>