Audio output debug recording.

media/audio/audio_manager.cc

Index: media/audio/audio_manager.cc
diff --git a/media/audio/audio_manager.cc b/media/audio/audio_manager.cc
index 30430bf58fad74f6e48e5dce5a7c851183777868..be1cd2c1f860fbd6e385a63ed5a6f4845d1cb4ba 100644
--- a/media/audio/audio_manager.cc
+++ b/media/audio/audio_manager.cc
@@ -45,6 +45,12 @@ AudioManager* g_last_created = nullptr;
 // suspends before a OnSuspend() event can be fired).
 const int kMaxFailedPingsCount = 3;
 
+// Dummy function for creating debug writer.
+std::unique_ptr<AudioFileWriter> CreateAudioFileWriterDummy(
+    const AudioParameters& params) {
+  return nullptr;
+}
+
 // Helper class for managing global AudioManager data and hang monitor. If the
 // audio thread is hung for > |kMaxFailedPingsCount| * |max_hung_task_time_|, we
 // want to record a UMA and optionally a non-crash dump to find offenders in the
@@ -301,7 +307,8 @@ void AudioManagerDeleter::operator()(const AudioManager* instance) const {
 ScopedAudioManagerPtr CreateAudioManager(
     scoped_refptr<base::SingleThreadTaskRunner> task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner,
-    AudioLogFactory* audio_log_factory);
+    AudioLogFactory* audio_log_factory,
+    CreateAudioFileWriterCallback create_audio_file_writer_callback);
 
 void AudioManager::SetMaxStreamCountForTesting(int max_input, int max_output) {
   NOTREACHED();
@@ -333,11 +340,13 @@ AudioManager::~AudioManager() {
 ScopedAudioManagerPtr AudioManager::Create(
     scoped_refptr<base::SingleThreadTaskRunner> task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner,
-    AudioLogFactory* audio_log_factory) {
+    AudioLogFactory* audio_log_factory,
+    CreateAudioFileWriterCallback create_audio_file_writer_callback) {
   DCHECK(task_runner);
   DCHECK(worker_task_runner);
   return CreateAudioManager(std::move(task_runner),
-                            std::move(worker_task_runner), audio_log_factory);
+                            std::move(worker_task_runner), audio_log_factory,
+                            std::move(create_audio_file_writer_callback));
 }
 
 // static
@@ -347,7 +356,8 @@ ScopedAudioManagerPtr AudioManager::CreateForTesting(
   g_helper.Pointer()->InitializeCOMForTesting();
 #endif
   return Create(task_runner, task_runner,
-                g_helper.Pointer()->fake_log_factory());
+                g_helper.Pointer()->fake_log_factory(),
+                base::Bind(&CreateAudioFileWriterDummy));
 }
 
 // static