Add AudioVisualPerception to MediaPerceptionPrivate API.

Bug: 808144
Change-Id: I04a25f1776b7299dfc9273108e5fc38ed8c34290
Reviewed-on: https://chromium-review.googlesource.com/897895
Commit-Queue: Wei Guan <weigua@chromium.org>
Reviewed-by: Toni Barzic <tbarzic@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536140}
4 files changed