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CastAudioOutputStream can now use internal backends with multizone. In
order for multizone to work, we first need to retrieve the multiroom
info and pass it to the backend.

BUG=b:111694183
TEST=Build, cast_media_unittests

Change-Id: I128a6b0cc1a389d01102007244fdb5594dd4c637
Reviewed-on: https://chromium-review.googlesource.com/1145892Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Aidan Wolter <awolter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578670}