code: func (c *Emulation) SetDefaultBackgroundColorOverrideWithParams(v *EmulationSetDefaultBackgroundColorOverrideParams) (*gcdmessage.ChromeResponse, error) {
  	return gcdmessage.SendDefaultRequest(c.target, c.target.GetSendCh(), &gcdmessage.ParamRequest{Id: c.target.GetId(), Method: "Emulation.setDefaultBackgroundColorOverride", Params: v})
  }
docs: // SetDefaultBackgroundColorOverrideWithParams - Sets or clears an override of the default background color of the frame. This override is used if the content does not specify one.