code: private static void track(String historyToken) {
  
          if (historyToken == null) {
              historyToken = "historyToken_null";
          }
  
          historyToken = URL.encode("/WWARN-GWT-Analytics/V1.0/" + historyToken);
          boolean hasErrored = false;
          try{
              trackGoogleAnalytics(historyToken);
          }catch (JavaScriptException e){
              hasErrored = true;
              GWT.log("Unable to track" ,e);
          }
          if(!hasErrored) GWT.log("Tracked " + historyToken);
      }
docs: track an event
  
  @param historyToken