Add "Failed" custom element state

third_party/WebKit/LayoutTests/custom-elements/spec/resources/custom-elements-helpers.js

-function create_window_in_test(t) {
+function create_window_in_test(t, srcdoc) {
   let p = new Promise((resolve) => {
     let f = document.createElement('iframe');
-    f.srcdoc = '';
+    f.srcdoc = srcdoc ? srcdoc : '';
     f.onload = (event) => {
       let w = f.contentWindow;
       t.add_cleanup(() => f.remove());
       resolve(w);
     };
     document.body.appendChild(f);
   });
   return p;
 }
 
-function test_with_window(f, name) {
+function test_with_window(f, name, srcdoc) {

[dominicc (has gone to gerrit), 2016/07/26 05:47:42]

Looks like this got mixed into this patch; it does not seem to be used.

   promise_test((t) => {
-    return create_window_in_test(t)
+    return create_window_in_test(t, srcdoc)
     .then((w) => {
       f(w);
     });
   }, name);
 }
 
 function assert_throws_dom_exception(global_context, code, func, description) {
   let exception;
   assert_throws(code, () => {
     try {
       func.call(this);
     } catch(e) {
       exception = e;
       throw e;
     }
   }, description);
   assert_true(exception instanceof global_context.DOMException, 'DOMException on the appropriate window');
 }