Support dispatching ServiceWorker FetchEvent and receiving response

content/test/data/service_worker/fetch_event_fallback.js

Index: content/test/data/service_worker/fetch_event_fallback.js
diff --git a/chrome/test/data/extensions/platform_apps/app_window/generic/index.js b/content/test/data/service_worker/fetch_event_fallback.js
similarity index 54%
copy from chrome/test/data/extensions/platform_apps/app_window/generic/index.js
copy to content/test/data/service_worker/fetch_event_fallback.js
index 54bd33540ec81cb933f50ae4abe9f3b4e7e19173..094bec9624a82cda12a7a4fcfafe4871171c9628 100644
--- a/chrome/test/data/extensions/platform_apps/app_window/generic/index.js
+++ b/content/test/data/service_worker/fetch_event_fallback.js
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-onload = function() {
-  chrome.test.sendMessage('window_loaded');
+this.onfetch = function(event) {
+    event.respondWith('This is not a Response object, so browser should ' +
+        'fallback to native');
 };