Enforce referrer policies for workers

LayoutTests/http/tests/security/contentSecurityPolicy/resources/worker.php

Index: LayoutTests/http/tests/security/contentSecurityPolicy/resources/worker.php
diff --git a/LayoutTests/http/tests/security/contentSecurityPolicy/resources/worker.php b/LayoutTests/http/tests/security/contentSecurityPolicy/resources/worker.php
index 5ea32c878bff1c3b2c6fc8cb478c0b979e275bc6..a090d783b36d3b03a6d9af8b509f248fbf76af07 100644
--- a/LayoutTests/http/tests/security/contentSecurityPolicy/resources/worker.php
+++ b/LayoutTests/http/tests/security/contentSecurityPolicy/resources/worker.php
@@ -81,5 +81,16 @@ postMessage(id === 0 ? "setTimeout blocked" : "setTimeout allowed");
 alert('PASS');
 
 <?php
+} else if ($_GET["type"] == "report-referrer") {
+?>
+
+var xhr = new XMLHttpRequest;

[Mike West, 2015/05/01 14:34:29]

Tiny tiny nit: It would be nice for our tests to start using `fetch` rather than
`XMLHttpRequest`. You don't need to change this CL at all, but think about it
going forward.

[estark, 2015/05/01 18:19:55]

Acknowledged.

+xhr.open("GET", "http://127.0.0.1:8000/security/resources/echo-referrer-header.php", true);
+xhr.onload = function () {
+    postMessage(this.responseText);
+};
+xhr.send();
+
+<?php
 }
 ?>