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This change adds logic to retrieve and listen for changes in multidevice
feature state and enables/disables establishing background connection from
service worker approriately.

Bug: 876163
Change-Id: I593a27f46a793678039ca40a1d0e49e97152c616
Reviewed-on: https://chromium-review.googlesource.com/1208143Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Jeremy Klein <jlklein@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: Azeem Arshad <azeemarshad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589411}