Add intermediate dataflow

Make sure that source intents are obtained from another intent's extras

java/ql/test/query-tests/security/CWE-940/AndroidIntentRedirectionTest.java

@@ -21,6 +21,8 @@ public class AndroidIntentRedirectionTest extends Activity {
             startActivity(intent); // $ hasAndroidIntentRedirection
         }
 
+        startActivity(getIntent()); // Safe - not an intent obtained from the Extras
+
         // @formatter:off
         startActivities(new Intent[] {intent}); // $ hasAndroidIntentRedirection
         startActivities(new Intent[] {intent}, null); // $ hasAndroidIntentRedirection