MediaRecorder: wire the bitRate settings in Blink and content (2nd go)

content/renderer/media/video_track_recorder.h

Index: content/renderer/media/video_track_recorder.h
diff --git a/content/renderer/media/video_track_recorder.h b/content/renderer/media/video_track_recorder.h
index c5c31b5996bea32ae3bddd8b84ba5bb3f5024cd0..63be64a8c7226e00c644530cc87f8accbb085b01 100644
--- a/content/renderer/media/video_track_recorder.h
+++ b/content/renderer/media/video_track_recorder.h
@@ -35,7 +35,8 @@ class CONTENT_EXPORT VideoTrackRecorder
   // |use_vp9| forces using VP9, otherwise VP8 will be used by default.
   VideoTrackRecorder(bool use_vp9,
                      const blink::WebMediaStreamTrack& track,
-                     const OnEncodedVideoCB& on_encoded_video_cb);
+                     const OnEncodedVideoCB& on_encoded_video_cb,
+                     int32_t bits_per_second);
   ~VideoTrackRecorder() override;
 
   void Pause();