track HTML5 Video percentages

[eduardocereto]

Just like we do for Youtube

[phms]

Digital Cube's team is working to correct this error.

[brodseba]

$('audio,video').bind('timeupdate', function(e) {
  var percentPlay = 1;
  var percentStr = "";
  var videosStateID = "";
  var videosLogStr = [];

  percentPlay= this.currentTime / this.duration * 100;
  if (percentPlay >= 99) {
      percentStr = "end";
  }
  else if (percentPlay >= 75) {
      percentStr = "75%";
  }
  else if (percentPlay >= 50) {
      percentStr = "50%";
  }
  else if (percentPlay >= 25) {
      percentStr = "25%";
  }
  else {
      percentStr = "start";
  }

  videosStateID = this.currentSrc + percentStr;

  if (videosLogStr.indexOf(videosStateID) == -1) {
    _gaq.push(['_trackEvent', 'Video', this.currentSrc, percentStr]);
    videosLogStr = videosLogStr + videosStateID;
  }
});

[tomfuertes]

Code above looks great! Feel free to reopen a PR with no jQuery dependency and get it into core.