IndexedDB: Added external memory counting for IDBValue.

third_party/WebKit/Source/modules/indexeddb/IDBValue.h

 // Copyright 2015 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 IDBValue_h
 #define IDBValue_h
 
 #include "modules/ModulesExport.h"
 #include "modules/indexeddb/IDBKey.h"
 #include "modules/indexeddb/IDBKeyPath.h"
 #include "platform/SharedBuffer.h"
 #include "public/platform/WebVector.h"
 #include "wtf/RefPtr.h"
 #include <memory>
 
 namespace blink {
 
 class BlobDataHandle;
+class SerializedScriptValue;
 class WebBlobInfo;
 struct WebIDBValue;
 
 class MODULES_EXPORT IDBValue final : public RefCounted<IDBValue> {
  public:
   static PassRefPtr<IDBValue> create();
   static PassRefPtr<IDBValue> create(const WebIDBValue&);
   static PassRefPtr<IDBValue> create(const IDBValue*,
                                      IDBKey*,
                                      const IDBKeyPath&);
   ~IDBValue();
 
   bool isNull() const;
   Vector<String> getUUIDs() const;
-  const SharedBuffer* data() const;
+  RefPtr<SerializedScriptValue> createSerializedValue() const;
   Vector<WebBlobInfo>* blobInfo() const { return m_blobInfo.get(); }
   const IDBKey* primaryKey() const { return m_primaryKey; }
   const IDBKeyPath& keyPath() const { return m_keyPath; }
 
  private:
   IDBValue();
   IDBValue(const WebIDBValue&);
   IDBValue(PassRefPtr<SharedBuffer>,
            const WebVector<WebBlobInfo>&,
            IDBKey*,
            const IDBKeyPath&);
   IDBValue(const IDBValue*, IDBKey*, const IDBKeyPath&);
 
+  // Keep this private to prevent new refs because we manually bookkeep the
+  // memory to V8.
   const RefPtr<SharedBuffer> m_data;
   const std::unique_ptr<Vector<RefPtr<BlobDataHandle>>> m_blobData;
   const std::unique_ptr<Vector<WebBlobInfo>> m_blobInfo;
   const Persistent<IDBKey> m_primaryKey;
   const IDBKeyPath m_keyPath;
+  int64_t m_externalAllocatedSize = 0;
 };
 
 }  // namespace blink
 
 #endif