Add basic Referrer-Policy support for Documents

third_party/WebKit/LayoutTests/http/tests/security/referrerPolicyHeader/resources/header-test.js

Index: third_party/WebKit/LayoutTests/http/tests/security/referrerPolicyHeader/resources/header-test.js
diff --git a/third_party/WebKit/LayoutTests/http/tests/security/referrerPolicyHeader/resources/header-test.js b/third_party/WebKit/LayoutTests/http/tests/security/referrerPolicyHeader/resources/header-test.js
new file mode 100644
index 0000000000000000000000000000000000000000..92f6d9a3f4c4c1a2809c572199720fd8f9c06d5c
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/http/tests/security/referrerPolicyHeader/resources/header-test.js
@@ -0,0 +1,16 @@
+async_test(function () {
+    var test = this;
+    window.addEventListener("message", test.step_func(function (event) {
+        assert_equals(event.data, expectedReferrer);
+        test.done();
+    }));
+
+    var iframe = document.createElement("iframe");
+    if (navigateTo === "downgrade")
+        iframe.src = get_host_info().HTTP_ORIGIN + "/security/referrerPolicyHeader/resources/postmessage-referrer.html";
+    else if (navigateTo === "same-origin")
+        iframe.src = "/security/referrerPolicyHeader/resources/postmessage-referrer.html";
+    else if (navigateTo === "cross-origin-no-downgrade")
+        iframe.src = get_host_info().AUTHENTICATED_ORIGIN + "/security/referrerPolicyHeader/resources/postmessage-referrer.html";
+    document.body.appendChild(iframe);
+}, "Referrer policy header - " + policy);