Yes, Inbox, Maps, Search, etc. are all in one repo in a specialized version control system. Android, Chromium, and Linux (among others, I'm sure) are different

Yes, Inbox, Maps, Search, etc. are all in one repo in a specialized version control system. Android, Chromium, and Linux (among others, I'm sure) are different in that they use git for version control so they are in their own separate repos.