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This CL creates the //chromeos/components/phonehub/ directory and
introduces a new class which provides the status of the Phone Hub
feature.

Currently, this new class is unit tested but not actually instantiated
in real code yet. A future CL will create a KeyedService and initialize
the class when the KeyedService starts up.

Bug: 1106937
Change-Id: I27f46f62d3246149d0cef53e4ea01dd41bb879e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2345665
Auto-Submit: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Josh Nohle <nohle@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796811}