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Removed toggleStartStop and made start/stop public.
Refactored placement of constants in files.
Added unknown error string.
Changed maxAlternative to 1.

Bug: 583291
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I203636264c495dd6b450d80b60c5796f41bb73c1
Reviewed-on: https://chromium-review.googlesource.com/660281
Commit-Queue: Ondrej Škopek <oskopek@google.com>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501230}