Revert of [Telemetry] Remove BuildbotOutputFormatter

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
Committed: https://crrev.com/d6cf8b4eaafdad2c2019aa67d9ae320d27d0548a
Cr-Commit-Position: refs/heads/master@{#332225}

[nednguyen, 2015-05-28 18:26:37]

Created Revert of [Telemetry] Remove BuildbotOutputFormatter

[nednguyen, 2015-05-28 18:27:02]

The CQ bit was checked by nednguyen@google.com

[nednguyen, 2015-05-28 18:27:41]

The CQ bit was unchecked by nednguyen@google.com

[eakuefner, 2015-06-01 17:03:00]

eakuefner@chromium.org changed reviewers:
+ prasadv@chromium.org, sullivan@chromium.org

[eakuefner, 2015-06-01 17:03:09]

The CQ bit was checked by eakuefner@chromium.org

[eakuefner, 2015-06-01 17:03:32]

The CQ bit was unchecked by eakuefner@chromium.org

[eakuefner, 2015-06-01 17:04:11]

The CQ bit was checked by eakuefner@chromium.org

[commit-bot: I haz the power, 2015-06-01 17:06:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1149373005/1

[commit-bot: I haz the power, 2015-06-01 18:26:35]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-01 18:27:37]

Patchset 1 (id:??) landed as
https://crrev.com/d6cf8b4eaafdad2c2019aa67d9ae320d27d0548a
Cr-Commit-Position: refs/heads/master@{#332225}