Audio output debug recording.

content/browser/renderer_host/media/audio_debug_file_writer.h

Index: content/browser/renderer_host/media/audio_debug_file_writer.h
diff --git a/content/browser/renderer_host/media/audio_debug_file_writer.h b/content/browser/renderer_host/media/audio_debug_file_writer.h
index 1ef10f186b18553f73abb4704db74359396bf592..49c85ae42da5631eb549dd9e118761af2a906fca 100644
--- a/content/browser/renderer_host/media/audio_debug_file_writer.h
+++ b/content/browser/renderer_host/media/audio_debug_file_writer.h
@@ -33,6 +33,9 @@ class CONTENT_EXPORT AudioDebugFileWriter
   explicit AudioDebugFileWriter(const media::AudioParameters& params);
   ~AudioDebugFileWriter() override;
 
+  static std::unique_ptr<media::AudioFileWriter> Create(
+      const media::AudioParameters& params);
+
   void Start(const base::FilePath& file) override;
   void Stop() override;
   void Write(std::unique_ptr<media::AudioBus> data) override;