Using Fusion Tables API with Google Distance Matrix API. This code is meant to be added to maps_lib.js

maps_lib_distance_matrix.js

queryPointDistances: function(whereClause) {
  MapsLib.query("'latitude', 'longitude'", whereClause,"MapsLib.getPointDistances");
},

getPointDistances: function(json) {
  MapsLib.handleError(json);
  var data = json["rows"];

  var destinations = [];
  var service = new google.maps.DistanceMatrixService();
  
  for (var row in data) {
    destinations[row] = new google.maps.LatLng(data[row][0], data[row][1]); // make a lat/long point
  }

  service.getDistanceMatrix(
  {
    origins: [MapsLib.currentPinpoint], // where we searched
    destinations: destinations,
    travelMode: google.maps.TravelMode.DRIVING,
    avoidHighways: false,
    avoidTolls: false
  }, pointDistanceCallback);
},

pointDistanceCallback: function(response, status) {
  // See Parsing the Results for
  // the basics of a callback function.
  // https://developers.google.com/maps/documentation/javascript/distancematrix#distance_matrix_parsing_the_results
}