IndexedDB: Added external memory counting for IDBValue.

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

Index: third_party/WebKit/Source/modules/indexeddb/IDBValue.h
diff --git a/third_party/WebKit/Source/modules/indexeddb/IDBValue.h b/third_party/WebKit/Source/modules/indexeddb/IDBValue.h
index 7fccf5615848f8db168373100619a96883d0b879..e536cc8159eaeeaba5125860751109713daef971 100644
--- a/third_party/WebKit/Source/modules/indexeddb/IDBValue.h
+++ b/third_party/WebKit/Source/modules/indexeddb/IDBValue.h
@@ -16,6 +16,7 @@
 namespace blink {
 
 class BlobDataHandle;
+class SerializedScriptValue;
 class WebBlobInfo;
 struct WebIDBValue;
 
@@ -30,7 +31,7 @@ class MODULES_EXPORT IDBValue final : public RefCounted<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; }
@@ -44,11 +45,14 @@ class MODULES_EXPORT IDBValue final : public RefCounted<IDBValue> {
            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