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This is the boundary between Commander internals and the rest of the
system.

Also includes the enable check and current logic (command line flag),
though nothing will happen until Initialize is hooked up (and nothing
*interesting* will happen until the WebUI CL lands).

Bug: 1014639
Change-Id: I9063766657fb4bceb8bbf11faab8655b515315a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500245
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821359}