Use google test to wrap our perf tests. This provides easy implementation with the Chromium perf bots. BUG=angleproject:744 Change-Id: I71c04e3d67cae9344ddca9fd95fd3c9849494922 Reviewed-on: https://chromium-review.googlesource.com/260644 Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Kenneth Russell <kbr@chromium.org>