Doc change: cherry-pick from master. ->Subject: Android application files for the Activity Testing Tutorial

Conflicts:

	build/sdk.atree

Change-Id: I5edb1d4d8a18fbda53a0e78ca6c9d20cf7d3ff4a
diff --git a/samples/Spinner/_index.html b/samples/Spinner/_index.html
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+<p>
+This sample is the application under test for the
+<a href="../../../resources/tutorials/testing/activity_test.html">Activity
+  Testing Tutorial</a>. It contains a single Activity that displays a
+Spinner widget backed by an array of strings containing the names of the planets
+in the Solar System. When an entry is selected from the Spinner, the entry is
+displayed in a text box.
+</p>
+<p>
+An important part of this application is state management. When the application
+is first run, the spinner widget displays a default selection of
+&quot;Earth&quot;. Thereafter, the application saves a selection as soon as it
+is made. The application remembers the selection from invocation to invocation, even
+if the device reboots.
+</p>
+<p>
+For more information about this application, see the Activity Testing Tutorial.
+The test application for this application is in the <a
+  href="../SpinnerTest/index.html">SpinnerTest</a> sample application.
+</p>
+
+<img alt="The Spinner application" src="../images/testing/spinner_main_screen.png" />