BUG=angleproject:968

Change-Id: I2d4c0a8e9a91a940922da4501c22124da0c0399c
Reviewed-on: https://chromium-review.googlesource.com/264840Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Olli Etuaho <oetuaho@nvidia.com>
Tested-by: Jamie Madill <jmadill@chromium.org>