code: func (c *Emulation) SetPageScaleFactorWithParams(v *EmulationSetPageScaleFactorParams) (*gcdmessage.ChromeResponse, error) {
  	return gcdmessage.SendDefaultRequest(c.target, c.target.GetSendCh(), &gcdmessage.ParamRequest{Id: c.target.GetId(), Method: "Emulation.setPageScaleFactor", Params: v})
  }
docs: // SetPageScaleFactorWithParams - Sets a specified page scale factor.