Adds ContentShellTest.apk and very simple test.

content/shell/android/javatests/AndroidManifest.xml

Index: content/shell/android/javatests/AndroidManifest.xml
diff --git a/content/shell/android/javatests/AndroidManifest.xml b/content/shell/android/javatests/AndroidManifest.xml
new file mode 100644
index 0000000000000000000000000000000000000000..b2affdb9bddf311b49798b7753cd73cd379bcd8a
--- /dev/null
+++ b/content/shell/android/javatests/AndroidManifest.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+  <!-- 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. -->
+  <!-- package name must be unique so suffix with "tests" so package loader
+       doesn't ignore this. -->
+  <manifest xmlns:android="http://schemas.android.com/apk/res/android"
+      package="org.chromium.content_shell.tests">
+    <!-- We add an application tag here just so that we can indicate that this
+         package needs to link against the android.test library, which is
+         needed when building test cases. -->
+    <application>
+        <uses-library android:name="android.test.runner" />
+    </application>
+    <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="14" />
+    <instrumentation android:name="android.test.InstrumentationTestRunner"
+        android:targetPackage="org.chromium.content_shell"
+        android:label="Tests for org.chromium.content_shell"/>
+    <uses-permission android:name="android.permission.RUN_INSTRUMENTATION" />
+    <uses-permission android:name="android.permission.INJECT_EVENTS" />
+</manifest>