code: func (c *Target) ActivateTarget(targetId string) (*gcdmessage.ChromeResponse, error) {
  	var v TargetActivateTargetParams
  	v.TargetId = targetId
  	return c.ActivateTargetWithParams(&v)
  }
docs: // ActivateTarget - Activates (focuses) the target.
  // targetId -