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diff --git a/Source/WebCore/Modules/indexeddb/shared/IDBResultData.h b/Source/WebCore/Modules/indexeddb/shared/IDBResultData.h
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+++ b/Source/WebCore/Modules/indexeddb/shared/IDBResultData.h
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+/*
+ * Copyright (C) 2015 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#if ENABLE(INDEXED_DATABASE)
+
+#include "IDBDatabaseInfo.h"
+#include "IDBError.h"
+#include "IDBGetAllResult.h"
+#include "IDBGetResult.h"
+#include "IDBKeyData.h"
+#include "IDBResourceIdentifier.h"
+#include "IDBTransactionInfo.h"
+#include "ThreadSafeDataBuffer.h"
+
+namespace WebCore {
+
+class ThreadSafeDataBuffer;
+
+enum class IDBResultType {
+    Error,
+    OpenDatabaseSuccess,
+    OpenDatabaseUpgradeNeeded,
+    DeleteDatabaseSuccess,
+    CreateObjectStoreSuccess,
+    DeleteObjectStoreSuccess,
+    ClearObjectStoreSuccess,
+    PutOrAddSuccess,
+    GetRecordSuccess,
+    GetAllRecordsSuccess,
+    GetCountSuccess,
+    DeleteRecordSuccess,
+    CreateIndexSuccess,
+    DeleteIndexSuccess,
+    OpenCursorSuccess,
+    IterateCursorSuccess,
+    RenameObjectStoreSuccess,
+    RenameIndexSuccess,
+};
+
+namespace IDBServer {
+class UniqueIDBDatabaseConnection;
+class UniqueIDBDatabaseTransaction;
+}
+
+class IDBResultData {
+public:
+    static IDBResultData error(const IDBResourceIdentifier&, const IDBError&);
+    static IDBResultData openDatabaseSuccess(const IDBResourceIdentifier&, IDBServer::UniqueIDBDatabaseConnection&);
+    static IDBResultData openDatabaseUpgradeNeeded(const IDBResourceIdentifier&, IDBServer::UniqueIDBDatabaseTransaction&);
+    static IDBResultData deleteDatabaseSuccess(const IDBResourceIdentifier&, const IDBDatabaseInfo&);
+    static IDBResultData createObjectStoreSuccess(const IDBResourceIdentifier&);
+    static IDBResultData deleteObjectStoreSuccess(const IDBResourceIdentifier&);
+    static IDBResultData renameObjectStoreSuccess(const IDBResourceIdentifier&);
+    static IDBResultData clearObjectStoreSuccess(const IDBResourceIdentifier&);
+    static IDBResultData createIndexSuccess(const IDBResourceIdentifier&);
+    static IDBResultData deleteIndexSuccess(const IDBResourceIdentifier&);
+    static IDBResultData renameIndexSuccess(const IDBResourceIdentifier&);
+    static IDBResultData putOrAddSuccess(const IDBResourceIdentifier&, const IDBKeyData&);
+    static IDBResultData getRecordSuccess(const IDBResourceIdentifier&, const IDBGetResult&);
+    static IDBResultData getAllRecordsSuccess(const IDBResourceIdentifier&, const IDBGetAllResult&);
+    static IDBResultData getCountSuccess(const IDBResourceIdentifier&, uint64_t count);
+    static IDBResultData deleteRecordSuccess(const IDBResourceIdentifier&);
+    static IDBResultData openCursorSuccess(const IDBResourceIdentifier&, const IDBGetResult&);
+    static IDBResultData iterateCursorSuccess(const IDBResourceIdentifier&, const IDBGetResult&);
+
+    WEBCORE_EXPORT IDBResultData(const IDBResultData&);
+
+    enum IsolatedCopyTag { IsolatedCopy };
+    IDBResultData(const IDBResultData&, IsolatedCopyTag);
+    IDBResultData isolatedCopy() const;
+
+    IDBResultType type() const { return m_type; }
+    IDBResourceIdentifier requestIdentifier() const { return m_requestIdentifier; }
+
+    const IDBError& error() const { return m_error; }
+    uint64_t databaseConnectionIdentifier() const { return m_databaseConnectionIdentifier; }
+
+    const IDBDatabaseInfo& databaseInfo() const;
+    const IDBTransactionInfo& transactionInfo() const;
+
+    const IDBKeyData* resultKey() const { return m_resultKey.get(); }
+    uint64_t resultInteger() const { return m_resultInteger; }
+
+    WEBCORE_EXPORT const IDBGetResult& getResult() const;
+    WEBCORE_EXPORT const IDBGetAllResult& getAllResult() const;
+
+    WEBCORE_EXPORT IDBResultData();
+    template<class Encoder> void encode(Encoder&) const;
+    template<class Decoder> static bool decode(Decoder&, IDBResultData&);
+
+private:
+    IDBResultData(const IDBResourceIdentifier&);
+    IDBResultData(IDBResultType, const IDBResourceIdentifier&);
+
+    static void isolatedCopy(const IDBResultData& source, IDBResultData& destination);
+
+    IDBResultType m_type { IDBResultType::Error };
+    IDBResourceIdentifier m_requestIdentifier;
+
+    IDBError m_error;
+    uint64_t m_databaseConnectionIdentifier { 0 };
+    std::unique_ptr<IDBDatabaseInfo> m_databaseInfo;
+    std::unique_ptr<IDBTransactionInfo> m_transactionInfo;
+    std::unique_ptr<IDBKeyData> m_resultKey;
+    std::unique_ptr<IDBGetResult> m_getResult;
+    std::unique_ptr<IDBGetAllResult> m_getAllResult;
+    uint64_t m_resultInteger { 0 };
+};
+
+template<class Encoder>
+void IDBResultData::encode(Encoder& encoder) const
+{
+    encoder << m_requestIdentifier << m_error << m_databaseConnectionIdentifier << m_resultInteger;
+
+    encoder.encodeEnum(m_type);
+
+    encoder << !!m_databaseInfo;
+    if (m_databaseInfo)
+        encoder << *m_databaseInfo;
+
+    encoder << !!m_transactionInfo;
+    if (m_transactionInfo)
+        encoder << *m_transactionInfo;
+
+    encoder << !!m_resultKey;
+    if (m_resultKey)
+        encoder << *m_resultKey;
+
+    encoder << !!m_getResult;
+    if (m_getResult)
+        encoder << *m_getResult;
+
+    encoder << !!m_getAllResult;
+    if (m_getAllResult)
+        encoder << *m_getAllResult;
+}
+
+template<class Decoder> bool IDBResultData::decode(Decoder& decoder, IDBResultData& result)
+{
+    if (!decoder.decode(result.m_requestIdentifier))
+        return false;
+
+    if (!decoder.decode(result.m_error))
+        return false;
+
+    if (!decoder.decode(result.m_databaseConnectionIdentifier))
+        return false;
+
+    if (!decoder.decode(result.m_resultInteger))
+        return false;
+
+    if (!decoder.decodeEnum(result.m_type))
+        return false;
+
+    bool hasObject;
+
+    if (!decoder.decode(hasObject))
+        return false;
+    if (hasObject) {
+        auto object = std::make_unique<IDBDatabaseInfo>();
+        if (!decoder.decode(*object))
+            return false;
+        result.m_databaseInfo = WTFMove(object);
+    }
+
+    if (!decoder.decode(hasObject))
+        return false;
+    if (hasObject) {
+        auto object = std::make_unique<IDBTransactionInfo>();
+        if (!decoder.decode(*object))
+            return false;
+        result.m_transactionInfo = WTFMove(object);
+    }
+
+    if (!decoder.decode(hasObject))
+        return false;
+    if (hasObject) {
+        auto object = std::make_unique<IDBKeyData>();
+        if (!decoder.decode(*object))
+            return false;
+        result.m_resultKey = WTFMove(object);
+    }
+
+    if (!decoder.decode(hasObject))
+        return false;
+    if (hasObject) {
+        auto object = std::make_unique<IDBGetResult>();
+        if (!decoder.decode(*object))
+            return false;
+        result.m_getResult = WTFMove(object);
+    }
+
+    if (!decoder.decode(hasObject))
+        return false;
+    if (hasObject) {
+        auto object = std::make_unique<IDBGetAllResult>();
+        if (!decoder.decode(*object))
+            return false;
+        result.m_getAllResult = WTFMove(object);
+    }
+
+    return true;
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(INDEXED_DATABASE)