Update example code to show how to use systemInfo.cpu and systemInfo.memory API.

chrome/common/extensions/docs/examples/api/systemInfo/main.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 var systemInfo = chrome.experimental.systemInfo;
 
 var indicator = {}
 var isStarted = false;
 
 function onStorageChanged(info) {
@@ skipping 11 matching lines @@
   isStarted = true;
 }
 
 function stopMonitor() {
   if (!isStarted) return;
   systemInfo.storage.onAvailableCapacityChanged.removeListener(
       onStorageChanged);
   isStarted = false;
 }
 
+function showStorageInfo(unit) {
+  table = "<tr><td>" + unit.id + "</td>" +
+    "<td>" + unit.type + "</td>" +
+    "<td>" + Math.round(unit.capacity/1024) + "</td>" +
+    "<td id=" + "\"" + unit.id + "\">" +
+    Math.round(unit.availableCapacity/1024) +
+    "</td></tr>\n";
+  return table;
+}
+
 function init() {
   document.getElementById("start-btn").onclick = startMonitor;
   document.getElementById("stop-btn").onclick = stopMonitor;
 
+  // Get CPU information.
+  chrome.experimental.systemInfo.cpu.get(function(cpu) {
+    var cpuInfo = "<b>Architecture:</b> " + cpu.archName +
+      "<br><b>Model Name: </b>" + cpu.modelName +
+      "<br><b>Number of Processors: </b>" + cpu.numOfProcessors;
+    var div = document.getElementById("cpu-info");
+    div.innerHTML = cpuInfo;
+  });
+  chrome.experimental.systemInfo.cpu.onUpdated.addListener(function(info) {
+    var table = "<br><table border=\"1\">\n" +
+      "<tr><td width=\"80px\"><b>Index</b></td>";
+    for (var i = 0; i < info.usagePerProcessor.length; i++) {
+      table += "<td width=\"120px\"><b>" + i + "</b></td>";
+    }
+    table += "<td width=\"120px\"><b>Total</b></td></tr>\n";
+    table += "<tr><td><b>History Usage</b></td>";
+    for (var i = 0; i < info.usagePerProcessor.length; i++) {
+      table += "<td>" + Math.round(info.usagePerProcessor[i]) + "</td>";
+    }
+    table += "<td>" + Math.round(info.averageUsage) + "</td></tr>";
+    table += "</table>\n";
+    var div = document.getElementById("cpu-cores");
+    div.innerHTML = table;
+  });
+
+  // Get memory information.
+  chrome.experimental.systemInfo.memory.get(function(memory) {
+    var memoryInfo =
+    "<b>Total Capacity:</b> " + Math.round(memory.capacity / 1024) + "KB" +
+    "<br><b>Available Capacity: </b>" +
+    Math.round(memory.availableCapacity / 1024) + "KB"
+    var div = document.getElementById("memory-info");
+    div.innerHTML = memoryInfo;
+  });
+
+  // Get storage information.
   chrome.experimental.systemInfo.storage.get(function(units) {
     var table = "<table width=65% border=\"1\">\n" +
       "<tr><td><b>ID</b></td>" +
-      "<td>Type</td>" +
-      "<td>Capacity (bytes)</td>" +
-      "<td>Available (bytes)</td>" +
+      "<td><b>Type</b></td>" +
+      "<td><b>Total Capacity (KB)</b></td>" +
+      "<td><b>Available Capacity (KB)</b></td>" +
       "</tr>\n";
     for (var i = 0; i < units.length; i++) {
       indicator[units[i].id] = 0;
       table += showStorageInfo(units[i]);
     }
     table += "</table>\n";
     var div = document.getElementById("storage-list");
     div.innerHTML = table;
   });
 }
 
-function showStorageInfo(unit) {
-  table = "<tr><td>" + unit.id + "</td>" +
-    "<td>" + unit.type + "</td>" +
-    "<td>" + unit.capacity + "</td>" +
-    "<td id=" + "\"" + unit.id + "\">" + unit.availableCapacity + "</td>" +
-    "</tr>\n";
-  return table;
-}
-
 document.addEventListener('DOMContentLoaded', init);