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Added on chromium.updater buildergroup.
This is to help updater team in easier monitoring of updater failures
on chrome official builds for win and mac.

Bug: 1155288
Change-Id: Ie65278f8f16f452cad0b72d525fc32e2b41a8240
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2572752Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Commit-Queue: Anjali Doneria <adoneria@google.com>
Cr-Commit-Position: refs/heads/master@{#833549}