[wasm] enable wasm structured cloning in specific cases

third_party/WebKit/LayoutTests/http/tests/wasm/resources/frame.html

+<script>
+  function listener(event) {
+    console.log("in frame");
+    var mod = event.data;
+    try {
+      var i = new WebAssembly.Instance(mod);
+      var ans = i.exports.increment(42);
+      console.log(ans);
+      event.source.postMessage(ans, "*");
+    } catch (e) {
+      event.source.postMessage(e, "*");
+    }
+  }
+
+  if (window.addEventListener){
+    addEventListener("message", listener, false)
+  } else {
+    attachEvent("onmessage", listener)
+  }
+</script>