Worklet: Introduce WorkletOptions for addModule()

third_party/WebKit/Source/core/workers/WorkletOptions.idl

+// Copyright 2017 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://fetch.spec.whatwg.org/#requestcredentials
+// Copied from modules/fetch/Request.idl because it's not accessible from core/
+// directory.
+// TODO(nhiroki): Consider how to reuse the existing enum.

[nhiroki, 2017/05/12 09:24:46]

yhirano@, any thoughts? Is it more preferable to move the enum from
modules/fetch/ to core/ than copy? 

[yhirano, 2017/05/12 10:56:34]

lgtm

+enum RequestCredentials { "omit", "same-origin", "include" };
+
+// https://drafts.css-houdini.org/worklets/#dictdef-workletoptions
+dictionary WorkletOptions {
+    RequestCredentials credentials = "omit";
+};