tests: link iframe tests

Author: marcoscaceres

index.html

@@ -2446,7 +2446,8 @@ <h2>
       <h2>
         <code>PaymentRequest</code> and <code>iframe</code> elements
       </h2>
-      <p>
+      <p data-tests=
+      "active-document-same-origin.https.html, allowpaymentrequest-attribute-cross-origin-bc-containers.https.html, allowpaymentrequest-attribute-same-origin-bc-containers.https.html, basic.https.html, no-attribute-cross-origin-bc-containers.https.html, no-attribute-same-origin-bc-containers.https.html">
         To indicate that a cross-origin <a>iframe</a> is allowed to invoke the
         payment request API, the <a>allowpaymentrequest</a> attribute can be
         specified on the <a>iframe</a> element.