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Chromium side of the implementation of tracking profile stats (number of profiles, number of signed in profiles) through the Omaha channel for Mac. Design doc: https://docs.google.com/a/google.com/document/d/15Ou8VCYNCZvke8Bw9bF3vYqD67voJBPyx_GBR8ONcCw/edit?disco=AAAAAKU7Zzg (Googler Only)

BUG=409895

Review URL: https://codereview.chromium.org/593243002

Cr-Commit-Position: refs/heads/master@{#318729}