code: function addListener(uid) {
  		var addedListener = false;
  		if(typeof(dashboardListeners[uid]) === 'undefined') {
  			dashboardListeners[uid] = {
  				'startTime': new Date(),
  				'numIterations': 0,
  				'uid': uid,
  				'numStarts': 1,
  			};
  			addedListener = true;
  		} else {
  			// Don't add the listener.
  			dashboardListeners[uid].numStarts += 1;
  		}
  		return addedListener;
  	}
docs: Function that adds a data listener.