Combine google-{stuff,tooling}

Google-related files should eventually be moved out of GitHub hosting and onto
Google infrastructure (e.g. Git on Borg).

When I do this, I should run:

```fish
> git grep --ignore-case google (git rev-list --all)
```

To assess the reference I've introduced into this repository.

Other tools that should come in handy when I do this are:
- git filter-branch
- BFG repo-cleaner

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