code: func (c *Cast) StartTabMirroring(sinkName string) (*gcdmessage.ChromeResponse, error) {
  	var v CastStartTabMirroringParams
  	v.SinkName = sinkName
  	return c.StartTabMirroringWithParams(&v)
  }
docs: // StartTabMirroring - Starts mirroring the tab to the sink.
  // sinkName -