Log audio system used to WebRTC log.

media/audio/audio_manager.h

Index: media/audio/audio_manager.h
diff --git a/media/audio/audio_manager.h b/media/audio/audio_manager.h
index 666fa1b0e531095bec36097d02e5a4f330211e70..887521a9d8c78db648774e5c38b73f8778499728 100644
--- a/media/audio/audio_manager.h
+++ b/media/audio/audio_manager.h
@@ -253,6 +253,9 @@ class MEDIA_EXPORT AudioManager {
   virtual std::unique_ptr<AudioLog> CreateAudioLog(
       AudioLogFactory::AudioComponent component) = 0;
 
+  // Gets the name of the audio manager (e.g., Windows, Mac, PulseAudio).
+  virtual const char* GetName() = 0;
+
  protected:
   AudioManager(scoped_refptr<base::SingleThreadTaskRunner> task_runner,
                scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner);