Ionic V3: Mylocation button is not working :Google maps

Ionic Framework ionic-v3
1

My location option not showing in google maps.

loadMap() {
this.geolocation.getCurrentPosition().then((position) => {
let latLng = new google.maps.LatLng(position.coords.latitude, position.coords.longitude);

  let mapOptions = {
    center: latLng,
    zoom: 10,
    streetViewControl: false,
    zoomControl: false,
    mapTypeControl: false,
    controls : {
      compass : true,
      myLocationButton : true,
      myLocation: true,
      indoorPicker : false,
      zoom : false,
      mapToolbar : true
    },
    mapTypeId: google.maps.MapTypeId.ROADMAP,

  }