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

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

Index: third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/foreign-fetch-worker.js
diff --git a/third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/foreign-fetch-worker.js b/third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/foreign-fetch-worker.js
index 0ea6e4adc3f96c70399da24e12f1834f8a5aa6b2..3e80a9fed98db69851e1d3c174887302fa0083f5 100644
--- a/third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/foreign-fetch-worker.js
+++ b/third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/foreign-fetch-worker.js
@@ -13,11 +13,11 @@ self.addEventListener('install', function(event) {
   });
 
 function handle_basic(event) {
-  event.respondWith({response: new Response('Foreign Fetch')});
+  event.respondWith({response: new Response('Foreign Fetch'), origin: event.origin});
 }
 
 function handle_onmessage(event) {
-  event.respondWith({response:
+  event.respondWith({origin: event.origin, response:
     new Response('<script>window.onmessage = e => e.ports[0].postMessage("failed");</script>',
                  {headers: {'Content-Type': 'text/html'}})});
 }
@@ -26,12 +26,22 @@ function handle_fallback(event) {
   // Do nothing.
 }
 
+function handle_meta(event) {
+  var data = {
+    origin: event.origin,
+    referrer: event.request.referrer
+  };
+  event.respondWith({response: new Response(JSON.stringify(data)),
+                     origin: event.origin});
+}
+
 self.addEventListener('foreignfetch', function(event) {
     var url = event.request.url;
     var handlers = [
       { pattern: '?basic', fn: handle_basic },
       { pattern: '?fallback', fn: handle_fallback },
-      { pattern: '?onmessage', fn: handle_onmessage }
+      { pattern: '?onmessage', fn: handle_onmessage },
+      { pattern: '?meta', fn: handle_meta }
     ];
 
     var handler = null;