Add polling and audio check to copresence.

components/copresence/mediums/audio/audio_player_impl.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/copresence/mediums/audio/audio_player_impl.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 92 matching lines @@
   {
     base::AutoLock al(state_lock_);
 
     samples_ = samples;
     frame_index_ = 0;
 
     if (is_playing_)
       return;
   }
 
+  VLOG(3) << "Starting playback.";
   is_playing_ = true;
   stream_->Start(this);
 }
 
 void AudioPlayerImpl::StopOnAudioThread() {
   DCHECK(media::AudioManager::Get()->GetTaskRunner()->BelongsToCurrentThread());
   if (!stream_)
     return;
 
+  VLOG(3) << "Stopping playback.";
   stream_->Stop();
   is_playing_ = false;
 }
 
 void AudioPlayerImpl::StopAndCloseOnAudioThread() {
   DCHECK(media::AudioManager::Get()->GetTaskRunner()->BelongsToCurrentThread());
   if (!stream_)
     return;
 
   if (is_playing_)
@@ skipping 47 matching lines @@
   base::RunLoop rl;
   media::AudioManager::Get()->GetTaskRunner()->PostTaskAndReply(
       FROM_HERE,
       base::Bind(base::IgnoreResult(&AudioPlayerImpl::FlushAudioLoopForTesting),
                  base::Unretained(this)),
       rl.QuitClosure());
   rl.Run();
 }
 
 }  // namespace copresence