/**
* @copyright    2016 Photon Storm Ltd.
* @license      {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
*/

/**
 * performance.now
 */
(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;
    }
  }

})();