/*eslint-disable*/

// @license http://opensource.org/licenses/MIT
// copyright Paul Irish 2015

// Date.now() is supported everywhere except IE8. For IE8 we use the Date.now polyfill
//   github.com/Financial-Times/polyfill-service/blob/master/polyfills/Date.now/polyfill.js
// as Safari 6 doesn't have support for NavigationTiming, we use a Date.now() timestamp for relative values

// if you want values similar to what you'd get with real perf.now, place this towards the head of the page
// but in reality, you're just getting the delta between now() calls, so it's not terribly important where it's placed

(function() {
  if ("performance" in window == false) {
    window.performance = {};
  }

  Date.now =
    Date.now ||
    function() {
      // thanks IE8
      return new Date().getTime();
    };

  if ("now" in window.performance == false) {
    var nowOffset = Date.now();

    if (performance.timing && performance.timing.navigationStart) {
      nowOffset = performance.timing.navigationStart;
    }

    window.performance.now = function now() {
      return Date.now() - nowOffset;
    };
  }
})();
