This patch will enable a Chromium-side CL to build dEQP/ANGLE with
GoogleTest.

BUG=angleproject:998
BUG=500736

Change-Id: Ie480e3319c1bd77dd1de2c964f78ef97297fcfe9
Reviewed-on: https://chromium-review.googlesource.com/280856Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>