code: func (c *Emulation) SetDefaultBackgroundColorOverride(color *DOMRGBA) (*gcdmessage.ChromeResponse, error) {
  	var v EmulationSetDefaultBackgroundColorOverrideParams
  	v.Color = color
  	return c.SetDefaultBackgroundColorOverrideWithParams(&v)
  }
docs: // SetDefaultBackgroundColorOverride - Sets or clears an override of the default background color of the frame. This override is used if the content does not specify one.
  // color - RGBA of the default background color. If not specified, any existing override will be cleared.