gistfile1.js

function onOpen(){
  // example send for Sheets
  sendGAMP("UA-XXXX-1", SpreadsheetApp.getActiveSpreadsheet().getUrl());
  
  // example send for Documents
  //sendGAMP("UA-XXXX-1", DocumentApp.getActiveDocument().getUrl());
  
  // example send for Forms *NOTE* getUrl not implemented yet in New Sheets
  //sendGAMP("UA-XXXX-1", FormApp.getActiveForm().getUrl());
}

/*
* Example function for Google Analytics Measurement Protocol.
* @param {string} tid Tracking ID / Web Property ID
* @param {string} url Document location URL
*/
function sendGAMP(tid, url){
  var payload = {'v': '1',
                 'tid': tid,
                 'cid': generateUUID_(),
                 'z': Math.floor(Math.random()*10E7),
                 't':'pageview',
                 'dl': url };
  var options = {'method' : 'POST',
                 'payload' : payload };
  UrlFetchApp.fetch('https://www.google-analytics.com/collect', options); 
}

// http://stackoverflow.com/a/2117523/1027723
function generateUUID_(){
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
      var r = Math.random()*16|0, v = c == 'x' ? r : (r&0x3|0x8);
      return v.toString(16);
    });
}