Added some test for visible behind activities.

Bug: 19225708
Change-Id: I26b2889063278e4deb0e48f1ce9354b39a1e1034
diff --git a/hostsidetests/services/activitymanager/app/AndroidManifest.xml b/hostsidetests/services/activitymanager/app/AndroidManifest.xml
index 7e1662d..522fd71 100755
--- a/hostsidetests/services/activitymanager/app/AndroidManifest.xml
+++ b/hostsidetests/services/activitymanager/app/AndroidManifest.xml
@@ -59,6 +59,19 @@
                   androidprv:alwaysFocusable="true"
                   android:exported="true"
         />
+        <activity android:name=".TranslucentActivity"
+                  android:theme="@style/Theme.Transparent"
+                  android:resizeable="true"
+                  android:supportsPictureInPicture="true"
+                  android:exported="true"
+                  android:taskAffinity="nobody.but.TranslucentActivity"
+        />
+        <activity android:name=".VisibleBehindActivity"
+                  android:resizeable="true"
+                  android:supportsPictureInPicture="true"
+                  android:exported="true"
+                  android:taskAffinity="nobody.but.VisibleBehindActivity"
+        />
     </application>
 </manifest>