Should list benchmark methods in the "Experiment selection" output

```
We forget to list benchmark methods, so then it's surprising when it tells you
you have 40 experiments when it seems like you should have only 10. (Because
there were, in this example, 4 benchmark methods.)
```

Original issue reported on code.google.com by `kevinb@google.com` on 28 Jan 2013 at 10:33