Audio output debug recording.

media/audio/fake_audio_manager.cc

Index: media/audio/fake_audio_manager.cc
diff --git a/media/audio/fake_audio_manager.cc b/media/audio/fake_audio_manager.cc
index 07e88a5b964c2d182451888d09ba2138049a62f8..73893713e348c82a8a1ea5a8f1d6c7714563874d 100644
--- a/media/audio/fake_audio_manager.cc
+++ b/media/audio/fake_audio_manager.cc
@@ -7,6 +7,8 @@
 #include <algorithm>
 #include <utility>
 
+#include "base/bind.h"
+
 namespace media {
 
 namespace {
@@ -14,6 +16,11 @@ namespace {
 const int kDefaultInputBufferSize = 1024;
 const int kDefaultSampleRate = 48000;
 
+std::unique_ptr<AudioFileWriter> CreateAudioFileWriterDummy(
+    const AudioParameters& params) {
+  return nullptr;
+}
+
 }  // namespace
 
 FakeAudioManager::FakeAudioManager(
@@ -22,8 +29,8 @@ FakeAudioManager::FakeAudioManager(
     AudioLogFactory* audio_log_factory)
     : AudioManagerBase(std::move(task_runner),
                        std::move(worker_task_runner),
-                       audio_log_factory) {
-}
+                       audio_log_factory,
+                       base::Bind(&CreateAudioFileWriterDummy)) {}
 
 FakeAudioManager::~FakeAudioManager() {
   Shutdown();