Bug 1462548 - Add crashtest. r=me

--HG--
extra : rebase_source : 8cafb85d648997504fa1a3e0397e5c3b64f31606

dom/base/crashtests/1462548.html

@@ -0,0 +1,13 @@
+<script>
+window.requestIdleCallback(function(){SpecialPowers.forceCC()});
+var limit = 0;
+function go() {
+limit++; if(limit > 2) { return; }
+  var b = document.createElement("blockquote").attachShadow({mode: "open"});
+  b.innerHTML = a.innerHTML;
+}
+</script>
+<data id="a">
+<audio>
+<source onerror="go()">
+<link>

dom/base/crashtests/crashtests.list

@@ -240,6 +240,7 @@ load 1449601.html
 load 1458016.html
 load 1459688.html
 load 1460794.html
+load 1462548.html
 load 1505811.html
 load 1505875.html
 load 1508845.html