BUG=angleproject:784

Change-Id: If5073a91bc4f47ade27c242d6966306600029f33
Reviewed-on: https://chromium-review.googlesource.com/316870Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Corentin Wallez <cwallez@chromium.org>