function renderHistory() {
  dom_history.innerHTML = "";
  var history_log = chrome.extension.getBackgroundPage().history_log;
  for (var i = 0; i < history_log.length; i++) {
    var data = history_log[i];
    renderItem(data['state'], data['time'], dom_history);
  }
}
Render the data gathered by the background page - should show a log
of "active" states.  No events are fired upon idle.