Enable sending MessagePorts to a different renderer (Chromium side)

content/test/data/click-noreferrer-links.html

Index: content/test/data/click-noreferrer-links.html
diff --git a/content/test/data/click-noreferrer-links.html b/content/test/data/click-noreferrer-links.html
index 6229aa1f10dd3d5ff9a2bc04e04de1b830f375c8..f195d657540611ca23f4c139578c0f8a3db58ddb 100644
--- a/content/test/data/click-noreferrer-links.html
+++ b/content/test/data/click-noreferrer-links.html
@@ -57,6 +57,24 @@
     receivedMessages++;
     event.source.postMessage(event.data, "*");
   }
+
+  // Send a message which contains a message port.
+  var mc;
+  function postWithPortToFoo() {
+    mc = new MessageChannel();
+    mc.port1.onmessage = portMessageReceived;
+    mc.port1.start();
+    var w = window.open("", "foo");
+    w.postMessage({message: "msg-with-port", port: mc.port2}, "*", [mc.port2]);
+    return true;
+  }
+
+  var receivedMessagesViaPort = 0;
+  function portMessageReceived(event) {
+    receivedMessagesViaPort++;
+    // Change the title to generate a notification.
+    document.title = event.data;
+  }
  </script>
  </head>