title: Google Maps 3 API - Click on feature (from geojson) and check if it contains location(s)
body: <p>I have loaded a geojson file successfully on my map. I am able to click each polygon to change stroke and access its properties. But I want to find out if certain points are within each multipolygon.</p>
  
  <p>I have used google.maps.geometry.poly.containsLocation() for normal polygons. Is there either a way to extract the polygon from event.feature.getGeometry()... to use in containsLocation or another method to check for this?</p>
  
  <pre><code>map.data.loadGeoJson('inc-tracts.json');
  var featureStyle = {
      strokeColor: '#000000',
      strokeOpacity: 0.5,
      strokeWeight: 3,
  }
  map.data.setStyle(featureStyle);
  map.data.addListener('click', function(event) {
      console.log(event.feature.getProperty("CTNAME"));
      // This is where I want to check if point(s) fall within it.
  }
  </code></pre>