title: Move marker without clearing GoogleMap
body: <p>I added a TileOverlay and some Markers into a map and I want to move a specific Marker on a map without using googleMap.clear() because TileOverlay will get cleared too. Is it possible to do it?</p>
  
  <pre><code>public void onPositionChanged(LatLng newPosition) {
      myMarker.position(newPosition);
      // myMarker should be updated on a map
  }
  </code></pre>