BUG=angleproject:1421

Change-Id: I08f0fa5f178c8d25cd2b02e75cf92759254aa918
Reviewed-on: https://chromium-review.googlesource.com/355020Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>