Introducing FetchEventInit Dictionary.

LayoutTests/http/tests/serviceworker/resources/interfaces-worker.js

 importScripts('interfaces.js');
 importScripts('worker-testharness.js');
 importScripts('/resources/testharness-helpers.js');
 
 var EVENT_HANDLER = 'object';
 
 test(function() {
     verify_interface('ServiceWorkerGlobalScope',
                      self,
                      {
@@ skipping 53 matching lines @@
                              add: 'function',
                              addAll: 'function',
                              put: 'function',
                              delete: 'function',
                              keys: 'function'
                            });
         });
   }, 'Cache');
 
 test(function() {
-    assert_equals(new ExtendableEvent('ExtendableEvent').type, 'ExtendableEvent');
+    assert_equals(
+      new ExtendableEvent('ExtendableEvent').type,
+      'ExtendableEvent', 'Type of ExtendableEvent should be ExtendableEvent');
+    assert_equals(
+      new FetchEvent('FetchEvent').type,
+      'FetchEvent', 'Type of FetchEvent should be FetchEvent');
+    assert_equals(
+      new FetchEvent('FetchEvent').cancelable,
+      true, 'Default FetchEvent.cancelable should be true');
+    assert_equals(
+      new FetchEvent('FetchEvent').bubbles,
+      false, 'Default FetchEvent.bubbles should be true');
+    assert_equals(
+      new FetchEvent('FetchEvent').isReload,
+      false, 'Default FetchEvent.isReload should be false');
+    assert_equals(
+      new FetchEvent('FetchEvent', {cancelable: false}).cancelable,
+      true, 'FetchEvent.cancelable should be true');
+    assert_equals(
+      new FetchEvent('FetchEvent', {isReload : true}).isReload, true,
+      'FetchEvent.isReload with option {isReload : true} should be true');
+    var req = new Request('http://localhost/',
+                          {method: 'POST',
+                           headers: [['Content-Type', 'Text/Html']]});
+    assert_equals(
+      new FetchEvent('FetchEvent', {request : req, isReload : true}).request.url,
+      'http://localhost/',
+      'FetchEvent.request.url should return the value it was initialized to');
   }, 'Event constructors');