title: How to show one label per multi-polygon in open layers 3?
body: <p>I'm having an issue trying to figure out how to show one label per multipolygon in OL3. It currently shows the label for every polygon which is not ideal under any circumstance in this particular scenario.</p>
  
  <p><img src="https://i.imgur.com/jivAThh.png" alt="screenshot"></p>
  
  <pre><code>var vector = new ol.layer.Vector({
  source: new ol.source.Vector({
      format: new ol.format.GeoJSON(),
      projection: 'EPSG:4326',
      url: 'resources/ol3/countries.geojson'
  }),
  style: function (feature, resolution) {
      style.getText().setText(resolution &lt; 10000 ? feature.get('NAME') : '');
      style.getFill().setColor('rgba(255, 255, 255, 0)');
      return styles;
  }});
  </code></pre>
  
  <p>I'd like to show the label on the largest polygon if possible.</p>