Add simple test case for @JavascriptInterface parameter flow

Author: egregius313

java/ql/test/library-tests/dataflow/taintsources/AndroidExposedObject.java

@@ -0,0 +1,11 @@
+import android.webkit.JavascriptInterface;
+
+public class AndroidExposedObject {
+    public void sink(Object o) {
+    }
+
+    @JavascriptInterface
+    public void test(String arg) {
+        sink(arg); // $hasRemoteValueFlow
+    }
+}