skip UpdateScripts step unless in production
skip UpdateScripts step unless in production

BUG=skia:2432
R=borenet@google.com

Author: epoger@google.com

Review URL: https://codereview.chromium.org/252383009

Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot