Many of these test cases are audio-only. Many of them are not "tough".

Also, add myself, John, and Dale as owners.

Bug: 772971
Change-Id: Ib5c7742c84cc7c9374436c56d2faadb0841cc32a
Reviewed-on: https://chromium-review.googlesource.com/752749


Reviewed-by: Ned Nguyen <nednguyen@google.com>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513694}