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

content/renderer/media/media_stream_audio_processor.cc

 // Copyright 2013 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/media_stream_audio_processor.h"
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "content/public/common/content_switches.h"
 #include "content/renderer/media/media_stream_audio_processor_options.h"
@@ skipping 246 matching lines @@
 void MediaStreamAudioProcessor::GetStats(AudioProcessorStats* stats) {
   stats->typing_noise_detected =
       (base::subtle::Acquire_Load(&typing_detected_) != false);
   GetAecStats(audio_processing_.get(), stats);
 }
 
 void MediaStreamAudioProcessor::InitializeAudioProcessingModule(
     const blink::WebMediaConstraints& constraints, int effects,
     MediaStreamType type) {
   DCHECK(!audio_processing_);
-  if (!CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kEnableAudioTrackProcessing)) {
+  if (!IsAudioTrackProcessingEnabled())
     return;
-  }
 
   RTCMediaConstraints native_constraints(constraints);
 
   // Only apply the fixed constraints for gUM of MEDIA_DEVICE_AUDIO_CAPTURE.
   DCHECK(IsAudioMediaType(type));
   if (type == MEDIA_DEVICE_AUDIO_CAPTURE)
     ApplyFixedAudioConstraints(&native_constraints);
 
   if (effects & media::AudioParameters::ECHO_CANCELLER) {
     // If platform echo canceller is enabled, disable the software AEC.
@@ skipping 200 matching lines @@
     return;
 
   StopAecDump();
 
   if (playout_data_source_)
     playout_data_source_->RemovePlayoutSink(this);
 
   audio_processing_.reset();
 }
 
+bool MediaStreamAudioProcessor::IsAudioTrackProcessingEnabled() const {
+  return CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableAudioTrackProcessing);
+}
+
 }  // namespace content