Gather serialization-related code into a directory.

third_party/WebKit/Source/bindings/core/v8/Transferables.h

-// 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.
-
-#ifndef Transferables_h
-#define Transferables_h
-
-#include "core/CoreExport.h"
-#include "platform/heap/Handle.h"
-#include "platform/wtf/Noncopyable.h"
-
-namespace blink {
-
-class DOMArrayBufferBase;
-class ImageBitmap;
-class OffscreenCanvas;
-class MessagePort;
-
-using ArrayBufferArray = HeapVector<Member<DOMArrayBufferBase>>;
-using ImageBitmapArray = HeapVector<Member<ImageBitmap>>;
-using OffscreenCanvasArray = HeapVector<Member<OffscreenCanvas>>;
-using MessagePortArray = HeapVector<Member<MessagePort>>;
-
-class CORE_EXPORT Transferables final {
-  STACK_ALLOCATED();
-  WTF_MAKE_NONCOPYABLE(Transferables);
-
- public:
-  Transferables() {}
-
-  ArrayBufferArray array_buffers;
-  ImageBitmapArray image_bitmaps;
-  OffscreenCanvasArray offscreen_canvases;
-  MessagePortArray message_ports;
-};
-
-// Along with extending |Transferables| to hold a new kind of transferable
-// objects, serialization handling code changes are required:
-//   - extend ScriptValueSerializer::copyTransferables()
-//   - alter SerializedScriptValue(Factory) to do the actual transfer.
-
-}  // namespace blink
-
-#endif  // Transferables_h