BUG=angleproject:463

Change-Id: If89a29de8fb006e8e3b0483ac5df21c8833ce974
Reviewed-on: https://chromium-review.googlesource.com/268511Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>