gin: Make it possible to use gin array buffers when running on top of blink

gin/public/isolate_holder.h

 // 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.
 
 #ifndef GIN_PUBLIC_ISOLATE_HOLDER_H_
 #define GIN_PUBLIC_ISOLATE_HOLDER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "gin/gin_export.h"
-
-namespace v8 {
-class Isolate;
-}
+#include "v8/include/v8.h"
 
 namespace gin {
 
 class PerIsolateData;
 
 // To embed Gin, first create an instance of IsolateHolder to hold the
 // v8::Isolate in which you will execute JavaScript. You might wish to subclass
 // IsolateHolder if you want to tie more state to the lifetime of the
 //
 // You can use gin in two modes: either gin manages V8, or the gin-embedder
 // manages gin. If gin manages V8, use the IsolateHolder constructor without
 // parameters, otherwise, the gin-embedder needs to create v8::Isolates and
 // pass them to IsolateHolder.
 //
 // It is not possible to mix the two.
 class GIN_EXPORT IsolateHolder {
  public:
   IsolateHolder();
+  IsolateHolder(v8::Isolate* isolate, v8::ArrayBuffer::Allocator* allocator);
+
+  // TODO(jochen): Remove.
   explicit IsolateHolder(v8::Isolate* isolate);
 
   ~IsolateHolder();
 
   v8::Isolate* isolate() { return isolate_; }
 
  private:
-  void Init();
+  void Init(v8::ArrayBuffer::Allocator* allocator);
 
   bool isolate_owner_;
   v8::Isolate* isolate_;
   scoped_ptr<PerIsolateData> isolate_data_;
 
   DISALLOW_COPY_AND_ASSIGN(IsolateHolder);
 };
 
 }  // namespace gin
 
 #endif  // GIN_PUBLIC_ISOLATE_HOLDER_H_