Roll 50: Copied IDLs, PYTHON scripts from WebKit removed deleted files in WebCore

modules/serviceworkers/ExtendableMessageEventInit.idl

Index: modules/serviceworkers/ExtendableMessageEventInit.idl
diff --git a/modules/serviceworkers/ExtendableMessageEventInit.idl b/modules/serviceworkers/ExtendableMessageEventInit.idl
new file mode 100644
index 0000000000000000000000000000000000000000..9d3bbe0f76cfc6600d898ef28f73fe179d8d4416
--- /dev/null
+++ b/modules/serviceworkers/ExtendableMessageEventInit.idl
@@ -0,0 +1,15 @@
+// Copyright 2016 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#extendablemessage-event-section
+
+[
+    RuntimeEnabled=ServiceWorkerExtendableMessageEvent,
+] dictionary ExtendableMessageEventInit : ExtendableEventInit {
+     any data;
+     DOMString origin;
+     DOMString lastEventId;
+     (Client or ServiceWorker or MessagePort)? source;
+     sequence<MessagePort>? ports;
+};