Service Worker: respondWith() invokes stopImmediatePropagation()

LayoutTests/http/tests/serviceworker/resources/fetch-event-respond-with-stops-propagation-worker.js

Index: LayoutTests/http/tests/serviceworker/resources/fetch-event-respond-with-stops-propagation-worker.js
diff --git a/LayoutTests/http/tests/serviceworker/resources/fetch-event-respond-with-stops-propagation-worker.js b/LayoutTests/http/tests/serviceworker/resources/fetch-event-respond-with-stops-propagation-worker.js
new file mode 100644
index 0000000000000000000000000000000000000000..18da049d69f4fbf94dca596a3de8139dfc5cc1f9
--- /dev/null
+++ b/LayoutTests/http/tests/serviceworker/resources/fetch-event-respond-with-stops-propagation-worker.js
@@ -0,0 +1,15 @@
+var result = null;
+
+self.addEventListener('message', function(event) {
+    event.data.port.postMessage(result);
+  });
+
+self.addEventListener('fetch', function(event) {
+    if (!result)
+      result = 'PASS';
+    event.respondWith(new Response());
+  });
+
+self.addEventListener('fetch', function(event) {
+    result = 'FAIL: fetch event propagated';
+  });