[gin] Introduce Wrappable::GetObjectTemplate

gin/object_template_builder.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/object_template_builder.h"
+#include "gin/public/wrapper_info.h"
 
 namespace gin {
 
 ObjectTemplateBuilder::ObjectTemplateBuilder(v8::Isolate* isolate)
     : isolate_(isolate), template_(v8::ObjectTemplate::New(isolate)) {
+  template_->SetInternalFieldCount(kNumberOfInternalFields);
 }
 
 ObjectTemplateBuilder::~ObjectTemplateBuilder() {
 }
 
 ObjectTemplateBuilder& ObjectTemplateBuilder::SetImpl(
     const base::StringPiece& name, v8::Handle<v8::Data> val) {
   template_->Set(StringToSymbol(isolate_, name), val);
   return *this;
 }
 
 ObjectTemplateBuilder& ObjectTemplateBuilder::SetPropertyImpl(
     const base::StringPiece& name, v8::Handle<v8::FunctionTemplate> getter,
     v8::Handle<v8::FunctionTemplate> setter) {
   template_->SetAccessorProperty(StringToSymbol(isolate_, name), getter,
                                  setter);
   return *this;
 }
 
 v8::Local<v8::ObjectTemplate> ObjectTemplateBuilder::Build() {
   v8::Local<v8::ObjectTemplate> result = template_;
   template_.Clear();
   return result;
 }
 
 }  // namespace gin