The chrome extension guide has a tutorial for the old analytics install: https://developer.chrome.com/extensions/tut_analytics.html
The instructions just say to link
I wrote up a blog post on this - How to add Google’s Universal Analytics tracking to a Chrome extension
Here's the guts of it:
// Standard Google Universal Analytics code
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','https://www.google-analytics.com/analytics.js','ga'); // Note: https protocol here
ga('create', 'UA-XXXXX-YY', 'auto');
ga('set', 'checkProtocolTask', function(){});
ga('send', 'pageview', '/options.html');
There are 3 points I’d particularly like to highlight:
checkProtocolTask with an empty function/options.html – otherwise Google Analytics will reject a URL in the format chrome-extension://gdocgfhmbfbbbmhnhmmejncjdcbjkhfc/options.html