Add a perf test for eglInitialize. Also shutdown performance, since it's not easy to only test one. BUG=angleproject:1014 Change-Id: I9d06426788ed336031271f8876589b111f1294b7 Reviewed-on: https://chromium-review.googlesource.com/273974 Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Brandon Jones <bajones@chromium.org>