code: func (c *Animation) SetPlaybackRateWithParams(v *AnimationSetPlaybackRateParams) (*gcdmessage.ChromeResponse, error) {
  	return gcdmessage.SendDefaultRequest(c.target, c.target.GetSendCh(), &gcdmessage.ParamRequest{Id: c.target.GetId(), Method: "Animation.setPlaybackRate", Params: v})
  }
docs: // SetPlaybackRateWithParams - Sets the playback rate of the document timeline.