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The approach here is to literally copy most of the logic in VideoSender
over into AudioSender, since VideoSender already solves a number of
transmission/re-transmission issues using heuristics that should work
well for audio.  (This also brings us much closer to being able to merge
AudioSender and VideoSender into one implementation.)

Testing: Confirmed correct halting and recovery behavior between
cast_sender_app and cast_receiver_app (SIGSTOPP'ed and SIGCONT'ed each
to simulate a temporary outage).  Also tested a Chromium sender with a
Chromecast receiver.

BUG=380023

Review URL: https://codereview.chromium.org/340903003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278323 0039d316-1c4b-4281-b951-d872f2087c98