Method panBy

src/google-maps/google-map/google-map.ts:359–362

* See * https://developers.google.com/maps/documentation/javascript/reference/map#Map.panBy

(x: number, y: number)

   * https://developers.google.com/maps/documentation/javascript/reference/map#Map.panBy
   */
  panBy(x: number, y: number) {
    this._assertInitialized();
    this.googleMap.panBy(x, y);
  }

  /**
   * See