code: function _getMappedMethod(message) {
              var method = message && message.method;
              var name = method && method.name;
              var args = method && method.args;
              var eventChannel = this.eventChannel;
  
              return function() {
                  if (eventChannel && eventChannel[name]) {
                      return eventChannel[name].apply(eventChannel, args);
                  }
                  else {
                      /* istanbul ignore next  */
                      PostMessageUtilities.log("No channel exists", "ERROR", "PostMessageMapper");
                  }
              };
          }
docs: Method getting the mapped method on the event channel after which it can be invoked
  @param {Object} message - the message to be mapped
  optional additional method arguments
  @return {Function} the function to invoke on the event channel
  @private