WebRTC touch not adjusting/drawing

I'd like to add touch function to our WebRTC demo site when whiteboard sharing is enabled and if drawing function is available at our web when image sharing function enabled. It can't adjust our web site well. I got source code from MDN but I think I have some mistakes but I'm unable to find where is wrong.

I have added JavaScript source into touch.js.
After login call 2003 and then you can see select bar, click WT BRD it can make available to draw into whiteboard through mouse event. But it's not available drawing with touch event.