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

modules/presentation/PresentationConnectionCloseEvent.idl

+// 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.
+
+// http://w3c.github.io/presentation-api/#interface-presentationconnectioncloseevent
+
+enum PresentationConnectionCloseReason { "error", "closed", "wentaway" };
+
+[
+    Constructor(DOMString type, PresentationConnectionCloseEventInit eventInitDict),
+    RuntimeEnabled=Presentation
+] interface PresentationConnectionCloseEvent : Event {
+    readonly attribute PresentationConnectionCloseReason reason;
+    readonly attribute DOMString message;
+};