Implement the auto-logout on idle feature for Kiosk mode.

chrome/app/generated_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!--
 This file contains definitions of resources that will be translated for each
 locale.  The variables is_win, is_macosx, is_linux, and is_posix are available
 for making strings OS specific.  Other platform defines such as use_titlecase
 are declared in build/common.gypi.
 -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
@@ skipping 11706 matching lines @@
     </if>
 
     <!-- Status Area Strings (not ChromeOS specific) -->
     <message name="IDS_STATUSBAR_CLOCK_OPEN_OPTIONS_DIALOG" desc="The menu item in the clock menu button for opening the options dialog">
       Open date and time settings...
     </message>
     <message name="IDS_STATUSBAR_CLOCK_TOOLTIP" desc="Tooltip for the clock in the status bar.">
       <ph name="DATE">$1<ex>Aug 16, 2010</ex></ph>
     </message>
 
+    <!-- Idle Logout Dialog Strings -->
+    <if expr="pp_ifdef('chromeos')">
+      <message name="IDS_IDLE_LOGOUT_TITLE" desc="Dialog title for the idle logout dialog">
+        Are you still there?
+      </message>
+      <message name="IDS_IDLE_LOGOUT_WARNING" desc="Warning for the idle logout dialog">
+        This Chromebook is now idle and will be restarted.
+        Press any key or move the pointer to continue exploring.
+        <ph name="LINE_BREAK">&lt;br&gt;&lt;br&gt;</ph>
+        <ph name="BEGIN_BOLD">&lt;strong&gt;</ph>
+        Restarting in: <ph name="END_BOLD">&lt;/strong&gt;</ph>
+        <ph name="TIME_LEFT">$1<ex>20</ex></ph> seconds.
+      </message>
+    </if>
+
     <!-- Imageburn Strings -->
     <if expr="pp_ifdef('chromeos')">
       <message name="IDS_CHECKING_FOR_UPDATES" desc="Notification for checking for update">
         Checking for updates...
       </message>
       <message name="IDS_IMAGEBURN_HEADER_TITLE" desc="Title that is displayed on image burning webpage ">
         Create OS Recovery Media
       </message>
       <message name="IDS_IMAGEBURN_HEADER_DESCRIPTION" desc="Text diplayed under image burning page title">
         If you ever need to restore your computer's operating system you'll need a recovery SD card or USB memory stick.
@@ skipping 3396 matching lines @@
     </messages>
     <structures fallback_to_english="true">
       <!-- Make sure these stay in sync with the structures in generated_resources.grd. -->
       <structure name="IDD_CHROME_FRAME_FIND_DIALOG" file="cf_resources.rc" type="dialog" >
       </structure>
       <structure name="IDD_CHROME_FRAME_READY_PROMPT" file="cf_resources.rc" type="dialog" >
       </structure>
     </structures>
   </release>
 </grit>