Expose and check origin of request in response for foreign fetch.

third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/foreign-fetch-cors-worker.js

Index: third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/foreign-fetch-cors-worker.js
diff --git a/third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/foreign-fetch-cors-worker.js b/third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/foreign-fetch-cors-worker.js
new file mode 100644
index 0000000000000000000000000000000000000000..1b819ceed2a09fb046f14968a6b080f55e749a6d
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/foreign-fetch-cors-worker.js
@@ -0,0 +1,30 @@
+importScripts('../../resources/get-host-info.js');
+var host_info = get_host_info();
+
+self.addEventListener('install', function(event) {
+    event.registerForeignFetch({scopes: [registration.scope], origins: ['*']});
+  });
+
+self.addEventListener('foreignfetch', function(event) {
+    var response = JSON.parse(decodeURIComponent(location.search.substring(1)));
+    var url = new URL(event.request.url);
+    var params = JSON.parse(decodeURIComponent(url.search.substring(1)));
+    var url_to_fetch = 'fetch-access-control.php?';
+    if (params.cross_origin) {
+      url_to_fetch =
+          host_info.HTTPS_ORIGIN + '/serviceworker/resources/' + url_to_fetch;
+    }
+    if (params.with_aceheaders)
+      url_to_fetch += 'ACEHeaders=X-ServiceWorker-ServerHeader&';
+    if (params.with_acaorigin)
+      url_to_fetch += 'ACAOrigin=*';
+    fetch_params = {};
+    if (params.cross_origin && !params.with_acaorigin)
+       fetch_params.mode = 'no-cors';
+    event.respondWith(fetch(url_to_fetch, fetch_params)
+      .then(r => {
+          response.response = r;
+          return response;
+        }));
+    return;
+  });