Roll IDL to Dartium37 (r181268)

modules/serviceworkers/FetchEvent.idl

Index: modules/serviceworkers/FetchEvent.idl
diff --git a/modules/serviceworkers/FetchEvent.idl b/modules/serviceworkers/FetchEvent.idl
new file mode 100644
index 0000000000000000000000000000000000000000..acb860f73c7740b862e5f744cb9f895a128222fb
--- /dev/null
+++ b/modules/serviceworkers/FetchEvent.idl
@@ -0,0 +1,13 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#fetch-event-interface
+[
+    RuntimeEnabled=ServiceWorker,
+    Exposed=ServiceWorker
+] interface FetchEvent : Event {
+    readonly attribute Request request;
+
+    [CallWith=ScriptState] void respondWith(any value);
+};