code: function(callbackUUID, result) {
      var callback = apiListeners[callbackUUID];
      if (callback) {
        if ( !(result && result instanceof Array )) {
          if(window.console && console.error){
            console.error('received result is not an array.', result);
          }
        }
        callback.apply(this, result);
        delete apiListeners[callbackUUID];
      }
    }
docs: Events called when callback are received from post message.
  @private
  @param callBackUUID the uuid of the callback to call
  @param result the result parameter to the caallback