BUG=angleproject:884

Change-Id: I30e688ca4304b0a0a1c939edee95d75faf8e8485
Reviewed-on: https://chromium-review.googlesource.com/266599Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>