Add refresh metadata script
Add refresh metadata script

Change-Id: I6080fe087ff95f8a386c029eea9d8c75a09ef4bf
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/496238
Reviewed-by: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>

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