Add a layout test for redirects with referrer-policy via service worker

Redirects with referrer-policy header need to respect a new referrer
policy. This tries to check if it's working when the request is in a service
worker's scope.

Bug: 855948
Change-Id: Icb923fa8b8345c128f02c41e042775ba5bf499ad
Reviewed-on: https://chromium-review.googlesource.com/1113171
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570298}

third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/referrer-policy-header.https.html

@@ -5,39 +5,41 @@
 <script src="/common/get-host-info.sub.js"></script>
 <script src="resources/test-helpers.sub.js"></script>
 <script>
-promise_test(function(t) {
-    var SCOPE = 'resources/referrer-policy-iframe.html';
-    var SCRIPT = 'resources/fetch-rewrite-worker-referrer-policy.js';
-    var host_info = get_host_info();
-    var body, unregister;
 
-    body = service_worker_unregister_and_register(t, SCRIPT, SCOPE)
-      .then(function(registration) {
-          unregister = registration.unregister.bind(registration);
-          return wait_for_state(t, registration.installing, 'activated');
-        })
-      .then(function() { return with_iframe(SCOPE); })
-      .then(function(frame) {
-          var channel = new MessageChannel();
-          t.add_cleanup(function() {
-              frame.remove();
-            });
+const SCOPE = 'resources/referrer-policy-iframe.html';
+const SCRIPT = 'resources/fetch-rewrite-worker-referrer-policy.js';
 
-          return new Promise(function(resolve) {
-              channel.port1.onmessage = resolve;
-              frame.contentWindow.postMessage({},
-                                              host_info['HTTPS_ORIGIN'],
-                                              [channel.port2]);
-            });
-        })
-      .then(function(e) {
-          assert_equals(e.data.results, 'finish');
-        });
+promise_test(async t => {
+    const registration =
+        await service_worker_unregister_and_register(t, SCRIPT, SCOPE);
+    await wait_for_state(t, registration.installing, 'activated');
+    promise_test(() => registration.unregister(),
+                 'Remove registration as a cleanup');
+}, 'Initialize global state (service worker registration)');
 
-      // Schedule un-registration to occur after test execution has completed,
-      // without hiding test failure.
-      return body
-        .then(unregister, unregister)
-        .then(function() { return body; });
-  }, 'Verify the referer with a Referrer Policy');
+promise_test(async t => {
+    const full_scope_url = new URL(SCOPE, location.href);
+    const redirect_to = `${full_scope_url.href}?ignore=true`;
+    const frame = await with_iframe(
+        `${SCOPE}?pipe=status(302)|header(Location,${redirect_to})|` +
+        'header(Referrer-Policy,origin)');
+    assert_equals(frame.contentDocument.referrer,
+                  full_scope_url.origin + '/');
+    t.add_cleanup(() => frame.remove());
+}, 'Referrer for a main resource redirected with referrer-policy (origin) ' +
+   'should only have origin.');
+
+promise_test(async t => {
+    const host_info = get_host_info();
+    const frame = await with_iframe(SCOPE);
+    const channel = new MessageChannel();
+    t.add_cleanup(() => frame.remove());
+    const e = await new Promise(resolve => {
+        channel.port1.onmessage = resolve;
+        frame.contentWindow.postMessage(
+            {}, host_info['HTTPS_ORIGIN'], [channel.port2]);
+    });
+    assert_equals(e.data.results, 'finish');
+}, 'Referrer for fetch requests initiated from a service worker with ' +
+   'referrer-policy (origin) should only have origin.');
 </script>