Revert of [Telemetry] Remove BuildbotOutputFormatter (patchset #3 id:40001 of https://codereview.chromium.org/
1157793003/)
Reason for revert:
Broke bisectors, which are still parsing buildbot output. (crbug.com/495137)
Original issue's description:
> [Telemetry] Remove BuildbotOutputFormatter
>
> This CL removes BuildbotOutputFormatter and its dependencies
> from Telemetry. It modifies stringification of values
> slightly in order to accommodate non-Page stories.
>
> BUG=477056
>
> Committed: https://crrev.com/
4b5e1f04136ae059e83b45e18b5bb1c7cc76edc7
> Cr-Commit-Position: refs/heads/master@{#331674}
TBR=eakuefner@chromium.org
BUG=477056
Review URL: https://codereview.chromium.org/
1149373005
Cr-Commit-Position: refs/heads/master@{#332225}