Adding a code sample for using AccessibilityNodeProvider to report virtual Views.

Note: This is a sample and does *not* affect the system image, rather only the SDK.

bug:5508317

Change-Id: I62bbef4b2a4c2789ddfa128e94ae37246d244ac0
diff --git a/samples/ApiDemos/_index.html b/samples/ApiDemos/_index.html
index 9466c95..ee230a9 100644
--- a/samples/ApiDemos/_index.html
+++ b/samples/ApiDemos/_index.html
@@ -36,6 +36,7 @@
 <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/AccessibilityNodeProviderActivity.html">Accessibility Node Provider</a></li>
 </ul>
 </div>