Enable src= background track switching by default

Bug: 663999
Change-Id: Ib83d981bbb6cefa3de9f3af0ea50c2a99b8d6876
Reviewed-on: https://chromium-review.googlesource.com/c/1406149
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Ted Meyer <tmathmeyer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#622157}
1 file changed