Our test sets (e.g. angle_perftests) were not having the config
applied.

BUG=angleproject:747

Change-Id: Idd3a2cba214d38a923c1936787f9dec4bd016326
Reviewed-on: https://chromium-review.googlesource.com/487730Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>