Enable building angle_perftests on Linux. BUG=chromium:675997 Change-Id: I3058892b80ccf61664d023419651fd4aa1dfec2a Reviewed-on: https://chromium-review.googlesource.com/423111 Reviewed-by: Corentin Wallez <cwallez@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>