Improve Activity Test Stability

Bug 5905393

Add screenSize to the list of config changes.

Change-Id: Idebccbf2c772ef51b879ea7f0a883ae49b2ebe5a
diff --git a/tests/AndroidManifest.xml b/tests/AndroidManifest.xml
index 4e674a8..22ba384 100644
--- a/tests/AndroidManifest.xml
+++ b/tests/AndroidManifest.xml
@@ -921,7 +921,7 @@
         <service android:name="android.app.cts.IntentServiceStub"/>
 
         <activity android:name="android.app.cts.LaunchpadActivity" 
-                  android:configChanges="keyboardHidden|orientation"
+                  android:configChanges="keyboardHidden|orientation|screenSize"
                   android:multiprocess="true">
         </activity>