Change-Id: Id26811014a3ddbe75ffbbceb9fba65d117a421ea
Reviewed-On: https://dev.dmitri.shuralyov.com/scratch/...$changes/1

These are tiny packages for testing purposes only.

This is the first Go package that doesn't map 1:1 to a repository.
It's a subdirectory inside a repository. Support for that is not
implemented yet. This package will be used to help with that.