title: Limiting result in country with Google Place autocomplete?
body: <p>I just tried <a href="https://github.com/googlesamples/android-play-places/tree/master/PlaceComplete" rel="nofollow">this demo</a>, but I can't find how to limit result in country.
  I also checked getAutocompletePredictions in com.google.android.gms.location.places.GeoDataApi, but I can't found any document to implement limiting country.</p>
  
  <p>I also searched some questions in SO; apparently it's JavaScript and needs to add some "optional param". So how to add optional param in this request?</p>