player.js

//  Send a message to YouTube's iframe to figure out what the current time is of the video element inside of the iframe.
requestCurrentTimeHighPrecision: function() {
  var iframePort = this.get('iframePort');
  iframePort.postMessage('getCurrentTimeHighPrecision');
}

_onYouTubeIFrameMessage: function(message) {
  if (!_.isUndefined(message.currentTimeHighPrecision)) {
    this.trigger('receive:currentTimeHighPrecision', this, message);
  }
}