Start to implement FetchEvent for ServiceWorker

Source/modules/serviceworkers/Response.idl

+// 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.
+
+[
+    Constructor(optional Dictionary responseInitDict),
+    RuntimeEnabled=ServiceWorker,
+    GlobalContext=ServiceWorkerGlobalScope,
+] interface Response {
+    attribute unsigned short statusCode;
+
+    // FIXME: Spec uses ByteString for these. We must perform the DOMString -> ByteString conversion manually,

[kinuko, 2014/02/26 05:42:49]

We don't have ByteString support anywhere yet?

[falken, 2014/02/27 06:45:09]

I don't think so. XHR code does it manually. I filed crbug.com/347426 with some
info.

+    // as described at http://heycam.github.io/webidl/#es-ByteString
+    attribute DOMString statusText;
+    attribute DOMString method;
+
+    // FIXME: Spec will eventually define "HeaderMap" interface.

[kinuko, 2014/02/26 05:42:49]

I think HeaderMap just inherits MapClass, which is in WebIDL (therefore the
nicer way to handle this is support it in binding layer)

[falken, 2014/02/27 06:45:09]

I updated the FIXME to be a bit more descriptive and filed crbug.com/347435

+    getter Dictionary headers();
+    setter void headers(Dictionary items);
+
+    // FIXME: Implement the following:
+    // attribute DOMString url;
+    // Promise<Blob> toBlob();
+};