code: func NewVolumeResizeMap(kubeClient clientset.Interface) VolumeResizeMap {
  	resizeMap := &volumeResizeMap{}
  	resizeMap.pvcrs = make(map[types.UniquePVCName]*PVCWithResizeRequest)
  	resizeMap.kubeClient = kubeClient
  	return resizeMap
  }
docs: // NewVolumeResizeMap returns new VolumeResizeMap which acts as a cache
  // for holding pending resize requests.