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Ash will continue talking to the power manager daemon via DBus,
while providing a mojo service that Chrome can connect to for its
power manager needs.

The mojo interface is only used by client code that explicitly
opts in, and only when a specific feature flag is passed.

This CL partially implements the Mojo interface as it's used by
BrightnessMonitor, which is to say, it implements very little.

Change-Id: Id0b286a690d1833b1090960cf31edfbe66124b24
Bug: 644348
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1531466
Commit-Queue: Evan Stade <estade@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652727}