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This change introduces a RoutineLog class to manage the logging of
routine status. Calls to `LogRoutineStarted` and `LogRoutineCompleted`
append lines to a log at a provided path.


Bug: 1128204
Change-Id: I379d9310371b703220788c674b21e641c184bbe7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2618841
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842789}