Fix/Add content_unittests to work for the code behind --enable-audio-track-processing

content/renderer/media/webrtc_audio_capturer.cc

 // Copyright (c) 2012 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 "content/renderer/media/webrtc_audio_capturer.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/string_util.h"
@@ skipping 446 matching lines @@
     audio_delay = base::TimeDelta::FromMilliseconds(audio_delay_milliseconds);
     audio_delay_ = audio_delay;
     key_pressed_ = key_pressed;
     tracks = tracks_.Items();
     tracks_.RetrieveAndClearTags(&tracks_to_notify_format);
 
     // Set the flag to turn on the audio processing in PeerConnection level.
     // Note that, we turn off the audio processing in PeerConnection if the
     // processor has already processed the data.
     need_audio_processing = need_audio_processing_ ?
-        !audio_processor_->has_audio_processing() : false;
+        !audio_processor_->IsAudioTrackProcessingEnabled() : false;

[tommi (sloooow) - chröme, 2014/03/11 13:30:58]

This isn't the same behavior as before.  IsAudioTrackProcessingEnabled checks a
command line flag whereas has_audio_processing() was for the track's
constraints, right?

[no longer working on chromium, 2014/03/11 14:34:44]

Yes. 
When the command line flag is on, |need_audio_processing| should be always false
since we don't want the APM in WebRtc anyway.

The code here is behaving the same as before, but I think it is more correct to
do it this way.

   }
 
   DCHECK(audio_processor_->InputFormat().IsValid());
   DCHECK_EQ(audio_source->channels(),
             audio_processor_->InputFormat().channels());
   DCHECK_EQ(audio_source->frames(),
             audio_processor_->InputFormat().frames_per_buffer());
 
   // Notify the tracks on when the format changes. This will do nothing if
   // |tracks_to_notify_format| is empty.
@@ skipping 102 matching lines @@
   DCHECK_NE(aec_dump_file, base::kInvalidPlatformFileValue);
   audio_processor_->StartAecDump(aec_dump_file);
 }
 
 void WebRtcAudioCapturer::StopAecDump() {
   DCHECK(thread_checker_.CalledOnValidThread());
   audio_processor_->StopAecDump();
 }
 
 }  // namespace content