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Add the first interactive routine, AC power, to cros_healthd.
This routine checks the power supply's status and type against
the routine inputs.

--gtest_filter=CrosHealthdServiceConnectionTest.*

Bug: chromium:1046452
Test: chromeos_unittests
Change-Id: I26a317c681781bed096513502240ba4663253fc8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2033809
Commit-Queue: Paul Moy <pmoy@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738213}