Adding ICS Accessibility Features to ApiDemos app.

Change-Id: I37485821a77fed483308434e7b1d407642379d8c
diff --git a/samples/ApiDemos/_index.html b/samples/ApiDemos/_index.html
index 9466c95..281364c 100644
--- a/samples/ApiDemos/_index.html
+++ b/samples/ApiDemos/_index.html
@@ -36,6 +36,9 @@
 <li><a href="src/com/example/android/apis/graphics/TouchPaint.html">Stylus and hover
 support</a></li>
 <li><a href="src/com/example/android/apis/view/Switches.html">Switch widget</a></li>
+<li><a
+  href="src/com/example/android/apis/accessibility/TaskBackService.html">Window
+  Querying Accessibility Service</a></li>
 </ul>
 </div>