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PhoneModel stores an in-memory model of the phone during a Phone Hub
session. Currently, it only holds a PhoneStatusModel, but future CLs
will add support for other parts of the model (e.g., notifications,
Chrome tabs, and quick action button status).

PhoneModel also provides an observer interface for clients to use to be
notified when the model changes. This CL also creates the
MutablePhoneModel class, which provides setters which can cause the
model's data to change.

PhoneHubManager instantiates a MutablePhoneModel when it is created and
exposes it publicly via a PhoneModel*, which ensures that clients of the
model cannot edit its contents.

Bug: 1106937
Change-Id: I011c4f62916b158b291eb4abb0f38ab91fef7ac5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2365225
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Regan Hsu <hsuregan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799975}