GitLab

Update variations_seed proto and metrics protos, and send seed versions
to UMA, so it's available for analysis.

Change-Id: Id2954646c6c000af8accde3e43f1eedc9e5c1c1f
Reviewed-on: https://chromium-review.googlesource.com/c/1339242Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610188}