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

modules/worklet/Worklet.idl

Index: modules/worklet/Worklet.idl
diff --git a/modules/worklet/Worklet.idl b/modules/worklet/Worklet.idl
new file mode 100644
index 0000000000000000000000000000000000000000..0744c691c0dd98f411149d5f620b9f71a07f81af
--- /dev/null
+++ b/modules/worklet/Worklet.idl
@@ -0,0 +1,13 @@
+// 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://drafts.css-houdini.org/worklets/#worklet
+
+[
+    DependentLifetime,
+    GarbageCollected,
+    RuntimeEnabled=Worklet,
+] interface Worklet {
+    [CallWith=ScriptState] Promise<void> import(DOMString url);
+};