BUG=angleproject:2041

Change-Id: Id5a85c40358b018c17984ac26ee7f97f10584d4b
Reviewed-on: https://chromium-review.googlesource.com/669642Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Olli Etuaho <oetuaho@nvidia.com>
Commit-Queue: Kai Ninomiya <kainino@chromium.org>