Start recording background video watch time.

content/browser/media/media_internals.h

Index: content/browser/media/media_internals.h
diff --git a/content/browser/media/media_internals.h b/content/browser/media/media_internals.h
index a9dadea8076eb5f432606eb8498bbbcebcc1783e..a82849391ce6e37ebf7d66919fdcbe18ba97c5e5 100644
--- a/content/browser/media/media_internals.h
+++ b/content/browser/media/media_internals.h
@@ -89,12 +89,13 @@ class CONTENT_EXPORT MediaInternals
                                            int render_frame_id,
                                            media::AudioLog* audio_log);
 
+  void OnProcessTerminatedForTesting(int process_id);
+
  private:
   // Inner class to handle reporting pipelinestatus to UMA
   class MediaInternalsUMAHandler;
 
   friend class AudioLogImpl;
-  friend class MediaInternalsTest;
 
   MediaInternals();