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

core/events/DragEvent.idl

Index: core/events/DragEvent.idl
diff --git a/core/events/DragEvent.idl b/core/events/DragEvent.idl
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index 0000000000000000000000000000000000000000..04047e2545a591aa34e0b51fc9496f312f91a55c
--- /dev/null
+++ b/core/events/DragEvent.idl
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+// Copyright 2015 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://html.spec.whatwg.org/multipage/interaction.html#dragevent
+
+[
+    Constructor(DOMString type, optional DragEventInit eventInitDict),
+] interface DragEvent : MouseEvent {
+    readonly attribute DataTransfer dataTransfer;
+};