Pass task runners to AudioManager constructor.

media/audio/audio_manager_factory.h

Index: media/audio/audio_manager_factory.h
diff --git a/media/audio/audio_manager_factory.h b/media/audio/audio_manager_factory.h
index 11f1338d0ba596d9af6817ed1b1f2e8bbc955929..938b519d4495adc00fe60c24d6c1e364361eb287 100644
--- a/media/audio/audio_manager_factory.h
+++ b/media/audio/audio_manager_factory.h
@@ -20,7 +20,10 @@ class MEDIA_EXPORT AudioManagerFactory {
 
   // Creates an instance of AudioManager implementation. Caller owns the
   // returned instance. |audio_log_factory| must outlive the returned instance.
-  virtual AudioManager* CreateInstance(AudioLogFactory* audio_log_factory) = 0;
+  virtual AudioManager* CreateInstance(
+      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
+      const scoped_refptr<base::SingleThreadTaskRunner>& worker_task_runner,
+      AudioLogFactory* audio_log_factory) = 0;
 };
 
 }  // namespace media