Add metadata to mirror.

BUG=b:295375906
TEST=CQ

Change-Id: I8282d6fb8bfbc311216d3b92dfa6c5117e7d724f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/gmmlib/+/4809184
Commit-Queue: Ilja Friedel <ihf@chromium.org>
Tested-by: Ilja Friedel <ihf@chromium.org>
Reviewed-by: Ilja Friedel <ihf@chromium.org>
Commit-Queue: Jao-ke Chin-Lee <jchinlee@chromium.org>
2 files changed