Allow cross-origin cssRules access to CORS-fetched stylesheet.

LayoutTests/http/tests/security/resources/green-if-cors-anonymous.php

Index: LayoutTests/http/tests/security/resources/green-if-cors-anonymous.php
diff --git a/LayoutTests/http/tests/security/resources/green-if-cors-anonymous.php b/LayoutTests/http/tests/security/resources/green-if-cors-anonymous.php
new file mode 100644
index 0000000000000000000000000000000000000000..7553fe0c8e7b0a4c266f614f00ad5e8dbe7df134
--- /dev/null
+++ b/LayoutTests/http/tests/security/resources/green-if-cors-anonymous.php
@@ -0,0 +1,15 @@
+<?php
+if (isset($_SERVER['HTTP_ORIGIN']) && !isset($_COOKIE['cookie'])) {
+    header("Access-Control-Allow-Origin: *");
+    $name = 'green-background.css';
+} else {
+    $name = 'red-background.css';
+}
+
+$fp = fopen($name, 'rb');
+header("Content-Type: text/css");
+header("Content-Length: " . filesize($name));
+
+fpassthru($fp);
+exit;
+?>