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

core/events/DragEventInit.idl

Index: core/events/DragEventInit.idl
diff --git a/modules/background_sync/PeriodicSyncEventInit.idl b/core/events/DragEventInit.idl
similarity index 52%
copy from modules/background_sync/PeriodicSyncEventInit.idl
copy to core/events/DragEventInit.idl
index 60d2b728b8a9eea69f187c8524845b5210a8c763..3b90386dc5af4b8f4335d78669054fe5cc21b7d1 100644
--- a/modules/background_sync/PeriodicSyncEventInit.idl
+++ b/core/events/DragEventInit.idl
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-dictionary PeriodicSyncEventInit : ExtendableEventInit {
-    required PeriodicSyncRegistration registration;
+// https://html.spec.whatwg.org/multipage/interaction.html#drageventinit
+
+dictionary DragEventInit : MouseEventInit {
+    DataTransfer? dataTransfer;
 };