BUG=angleproject:1455

Change-Id: I263719cc77ff80580a551683d062e862dee1bdab
Reviewed-on: https://chromium-review.googlesource.com/365826Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>