gistfile1.rb

// Forward all postMessage calls from the iframes that have data in the form {method:, arguments:} directly to Segment.
window.onmessage = function(e){
  var method = e.data.method;
  var args = e.data.arguments ? _.values(e.data.arguments) : null;
  if (analytics[method]) {
    analytics[method].apply(analytics, args);
  }
};