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This class provides an interface for the Phone Hub UI to ring the
connected phone as part of the FindMyDevice feature; additionally, it
provides an API for checking whether the phone is currently ringing.

The implementation of setting/retrieving the phone ringing state will be
part of a future CL.

Bug: 1106937
Change-Id: Ia100f320bd782e307fdae85581ef45b43bcc1c2a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2378728
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Regan Hsu <hsuregan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802315}