[Gin] Add a mechanism for wrapping C++ object

gin/array_buffer.cc

 // Copyright 2013 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.
 
 #include "gin/array_buffer.h"
 
 #include <stdlib.h>
 
 namespace gin {
 
@@ skipping 89 matching lines @@
 }
 
 ArrayBuffer::Private::~Private() {
   ArrayBufferAllocator::SharedInstance()->Free(buffer_, length_);
 }
 
 void ArrayBuffer::Private::WeakCallback(
     const v8::WeakCallbackData<v8::ArrayBuffer, Private>& data) {
   Private* parameter = data.GetParameter();
   parameter->array_buffer_.Reset();
-  // parameter->self_reference_.clear();
+  parameter->self_reference_ = NULL;
 }
 
 // ArrayBuffer ----------------------------------------------------------------
 
 ArrayBuffer::ArrayBuffer(v8::Isolate* isolate)
     : isolate_(isolate),
       bytes_(0),
       num_bytes_(0) {
 }
 
@@ skipping 41 matching lines @@
 bool Converter<ArrayBufferView>::FromV8(v8::Handle<v8::Value> val,
                                         ArrayBufferView* out) {
   if (!val->IsArrayBufferView())
     return false;
   *out = ArrayBufferView(out->isolate(),
                          v8::Handle<v8::ArrayBufferView>::Cast(val));
   return true;
 }
 
 }  // namespace gin