Changing manifest to v2 extension samples

chrome/common/extensions/docs/examples/api/idle/idle_simple/history.js

+/**
+ * Convert a state and time into a nice styled chunk of HTML.
+ */
+function renderState(state, time) {
+  var now = new Date().getTime();
+  var diff = Math.round((time.getTime() - now) / 1000);
+  var str = (diff == 0) ?
+      "now" :
+      Math.abs(diff) + " seconds " + (diff > 0 ? "from now" : "ago");
+  var col = (state == "active") ?
+      "#009900" :
+      "#990000";
+  return "<b style='color: " + col + "'>" + state + "</b> " + str;
+};
+
+/**
+ * Creates DOM and injects a rendered state into the page.
+ */
+function renderItem(state, time, parent) {
+  var dom_item = document.createElement('li');
+  dom_item.innerHTML = renderState(state, time);
+  parent.appendChild(dom_item);
+};
+
+// Store previous state so we can show deltas.  This is important
+// because the API currently doesn't fire idle messages, and we'd
+// like to keep track of last time we went idle.
+var laststate = null;
+var laststatetime = null;
+
+/**
+ * Checks the current state of the browser.
+ */
+function checkState() {
+  threshold = parseInt(document.querySelector('#idle-threshold').value);
+  var dom_threshold = document.querySelector('#idle-set-threshold');
+  dom_threshold.innerText = threshold;
+
+  // Request the state based off of the user-supplied threshold.
+  chrome.idle.queryState(threshold, function(state) {
+    var time = new Date();
+    if (laststate != state) {
+      laststate = state;
+      laststatetime = time;
+    }
+
+    // Keep rendering results so we get a nice "seconds elapsed" view.
+    var dom_result = document.querySelector('#idle-state');
+    dom_result.innerHTML = renderState(state, time);
+    var dom_laststate = document.querySelector('#idle-laststate');
+    dom_laststate.innerHTML = renderState(laststate, laststatetime);
+  });
+};
+
+var dom_history = document.querySelector('#idle-history');
+
+/**
+ * Render the data gathered by the background page - should show a log
+ * of "active" states.  No events are fired upon idle.
+ */
+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);
+  }
+};
+
+
+document.addEventListener('DOMContentLoaded', function() {
+  // Check every second (even though this is overkill - minimum idle
+  // threshold is 15 seconds) so that the numbers appear to be counting up.
+  checkState();
+  window.setInterval(checkState, 1000);
+
+  // Check every second (see above).
+  renderHistory();
+  window.setInterval(renderHistory, 1000);
+});