Add polling and audio check to copresence.

components/copresence/mediums/audio/audio_recorder_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_recorder_impl.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 126 matching lines @@
     return;
   }
   stream_->SetVolume(stream_->GetMaxVolume());
 }
 
 void AudioRecorderImpl::RecordOnAudioThread() {
   DCHECK(media::AudioManager::Get()->GetTaskRunner()->BelongsToCurrentThread());
   if (!stream_ || is_recording_)
     return;
 
+  VLOG(3) << "Starting recording.";
   converter_->Reset();
   stream_->Start(this);
   is_recording_ = true;
 }
 
 void AudioRecorderImpl::StopOnAudioThread() {
   DCHECK(media::AudioManager::Get()->GetTaskRunner()->BelongsToCurrentThread());
   if (!stream_ || !is_recording_)
     return;
 
+  VLOG(3) << "Stopping recording.";
   stream_->Stop();
   is_recording_ = false;
 }
 
 void AudioRecorderImpl::StopAndCloseOnAudioThread() {
   DCHECK(media::AudioManager::Get()->GetTaskRunner()->BelongsToCurrentThread());
   if (!stream_)
     return;
 
   StopOnAudioThread();
@@ skipping 81 matching lines @@
   media::AudioManager::Get()->GetTaskRunner()->PostTaskAndReply(
       FROM_HERE,
       base::Bind(
           base::IgnoreResult(&AudioRecorderImpl::FlushAudioLoopForTesting),
           base::Unretained(this)),
       rl.QuitClosure());
   rl.Run();
 }
 
 }  // namespace copresence