Polymer 3 - Google Maps

I would like to know how to include Google Map in Polymer 3. I have just upgraded to Polymer 3 from Polymer 2. This is my sample that is not working base of the starter-kit

import { PolymerElement, html } from '@polymer/polymer/polymer-element.js';
import '@em-polymer/google-map/google-map.js';
import '@em-polymer/google-map/google-map-marker.js';
import './shared-styles.js';

class MyView1 extends PolymerElement {
  static get template() {
    return html`
      <style include="shared-styles">
        :host {
          display: block;

          padding: 10px;
        }
      google-map {
        height: 600px;
        width: 600px;
      }     
      </style>

      <google-map latitude="37.779" longitude="-122.3892" min-zoom="9" max-zoom="11" language="en" api-key="XYZ">
      </google-map>
      <div class="card">
        <div class="circle">1</div>
        <h1>View One</h1>
        <p>Ut labores minimum atomorum pro. Laudem tibique ut has.</p>
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      </div>

    `;
  }
}

window.customElements.define('my-view1', MyView1);

I get the following 2 errors:

element-mixin.js:322 template getter must return HTMLTemplateElement

and

Uncaught TypeError: Cannot read property 'api' of undefined
    at HTMLElement._initGMap (google-map.js:480)
    at HTMLElement.attached (google-map.js:457)
    at HTMLElement.attached (class.js:262)
    at HTMLElement.connectedCallback (legacy-element-mixin.js:117)
    at HTMLElement._attachDom (element-mixin.js:653)
    at HTMLElement._readyClients (element-mixin.js:620)
    at HTMLElement._flushClients (property-effects.js:1749)
    at HTMLElement.ready (property-effects.js:1853)
    at HTMLElement.ready (element-mixin.js:604)
    at HTMLElement._enableProperties (properties-changed.js:363)

@em-polymer/google-map/google-map.js was

import { Polymer } from '../../@polymer/polymer/lib/legacy/polymer-fn.js';
import { IronResizableBehavior } from '../../@polymer/iron-resizable-behavior/iron-resizable-behavior.js';
import '../google-apis/google-maps-api.js';
import './google-map-marker.js';
Polymer({
  _template: `
    <style>

and fix is

import { Polymer } from '../../@polymer/polymer/lib/legacy/polymer-fn.js';
import { IronResizableBehavior } from '../../@polymer/iron-resizable-behavior/iron-resizable-behavior.js';
import '../google-apis/google-maps-api.js';
import './google-map-marker.js';
import { html } from '@polymer/polymer/lib/utils/html-tag.js';
Polymer({
  _template: html`
    <style>