BUG=angleproject:1147

Change-Id: I7f3e77f8f5f55887fe03172eadce78129ffeb10f
Reviewed-on: https://chromium-review.googlesource.com/298064Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Tryjob-Request: Dian Xiang <dianx@google.com>
Tested-by: Dian Xiang <dianx@google.com>