BUG=angleproject:851

Change-Id: I50c3b3a4f00b27fed85f09509738513a441c7b5b
Reviewed-on: https://chromium-review.googlesource.com/363990Reviewed-by: Olli Etuaho <oetuaho@nvidia.com>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>