Add WebglOverlayVeiw to google-map

[AyalaBarzilay]

Feature Description

Google lately released WebglOverlayVeiw feature and i would like to use in in my angular app.

I am trying to add it to my angular app and getting the following error:
"error TS2339: Property 'WebglOverlayView' does not exist on type 'typeof maps'."

[crisbeto]

Sounds reasonable, but it'll have to wait for #23350.

[umernaeem217]

@crisbeto I need your suggestion for implementing the Lifecycle hooks. Is It okay if I create separate event emitters for these lifecycle hooks and then on the constructor when the WebglOverlayView object is created bind the method with that object and trigger the event in the execution of those methods?

@Output() readonly overlayAdded: EventEmitter<void> = new EventEmitter<void>();

ngOnInit() {
  this._ngZone.runOutsideAngular(() => {
        this.webglOverlayView = new google.maps.WebglOverlayView();;
      });
 this.webglOverlayView.onAdd = () => {
    this.overlayAdded.emit();
  }
}

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