code: func (c *Page) ScreencastFrameAck(sessionId int) (*gcdmessage.ChromeResponse, error) {
  	var v PageScreencastFrameAckParams
  	v.SessionId = sessionId
  	return c.ScreencastFrameAckWithParams(&v)
  }
docs: // ScreencastFrameAck - Acknowledges that a screencast frame has been received by the frontend.
  // sessionId - Frame number.