BUG=angleproject:964

Change-Id: I8eb3cfd8d49beded4ac55ead97b50c7691e4980a
Reviewed-on: https://chromium-review.googlesource.com/263710Tested-by: Olli Etuaho <oetuaho@nvidia.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>