BUG=angleproject:773

Change-Id: I8b01a1f187456eb8997fc7a620b5ecdffb872c19
Reviewed-on: https://chromium-review.googlesource.com/221810Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
Tested-by: Kenneth Russell <kbr@chromium.org>