Upstream service worker `fetch` tests to WPT

third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/fetch-event.https.html

Index: third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/fetch-event.https.html
diff --git a/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/fetch-event.https.html b/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/fetch-event.https.html
index 062a41e779dfc7784d8d3c24db9ef90bc1d6ab2b..ba313c5f010b92e0584707da8f3eadf9c7f0b24c 100644
--- a/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/fetch-event.https.html
+++ b/third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/fetch-event.https.html
@@ -8,6 +8,35 @@
 var worker = 'resources/fetch-event-test-worker.js';
 
 async_test(function(t) {
+    const scope = 'resources/simple.html?headers';
+    service_worker_unregister_and_register(t, worker, scope)
+      .then(function(reg) {
+          return wait_for_state(t, reg.installing, 'activated');
+        })
+      .then(function() { return with_iframe(scope); })
+      .then(function(frame) {
+          t.add_cleanup(function() { frame.remove(); });
+          const headers = JSON.parse(frame.contentDocument.body.textContent);
+          const header_names = {};
+          for (const [name, value] of headers) {
+            header_names[name] = true;
+          }
+
+          assert_true(
+            header_names.hasOwnProperty('accept'),
+            'request includes "Accept" header as inserted by Fetch'
+          );
+          assert_true(
+            header_names.hasOwnProperty('upgrade-insecure-requests'),
+            'request specifies "Upgrade-Insecure Requests header as inserted by Fetch'
+          );
+
+          return service_worker_unregister_and_done(t, scope);
+        })
+      .catch(unreached_rejection(t));
+  }, 'Service Worker headers in the request of a fetch event');
+
+async_test(function(t) {
     var scope = 'resources/simple.html?string';
     service_worker_unregister_and_register(t, worker, scope)
       .then(function(reg) {