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diff --git a/Source/WebKit2/DatabaseProcess/DatabaseProcess.h b/Source/WebKit2/DatabaseProcess/DatabaseProcess.h
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+++ b/Source/WebKit2/DatabaseProcess/DatabaseProcess.h
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+/*
+ * Copyright (C) 2013 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(DATABASE_PROCESS)
+
+#include "ChildProcess.h"
+#include "SandboxExtension.h"
+#include <WebCore/IDBBackingStore.h>
+#include <WebCore/IDBServer.h>
+#include <WebCore/UniqueIDBDatabase.h>
+#include <wtf/CrossThreadTask.h>
+#include <wtf/NeverDestroyed.h>
+
+namespace WebCore {
+class SessionID;
+struct SecurityOriginData;
+}
+
+namespace WebKit {
+
+class DatabaseToWebProcessConnection;
+enum class WebsiteDataType;
+struct DatabaseProcessCreationParameters;
+
+class DatabaseProcess : public ChildProcess
+#if ENABLE(INDEXED_DATABASE)
+    , public WebCore::IDBServer::IDBBackingStoreTemporaryFileHandler
+#endif
+{
+    WTF_MAKE_NONCOPYABLE(DatabaseProcess);
+    friend class NeverDestroyed<DatabaseProcess>;
+public:
+    static DatabaseProcess& singleton();
+    ~DatabaseProcess();
+
+#if ENABLE(INDEXED_DATABASE)
+    const String& indexedDatabaseDirectory() const { return m_indexedDatabaseDirectory; }
+
+    void ensureIndexedDatabaseRelativePathExists(const String&);
+    String absoluteIndexedDatabasePathFromDatabaseRelativePath(const String&);
+
+    WebCore::IDBServer::IDBServer& idbServer();
+#endif
+
+    WorkQueue& queue() { return m_queue.get(); }
+
+    void postDatabaseTask(CrossThreadTask&&);
+
+#if ENABLE(INDEXED_DATABASE)
+    // WebCore::IDBServer::IDBBackingStoreFileHandler
+    void prepareForAccessToTemporaryFile(const String& path) final;
+    void accessToTemporaryFileComplete(const String& path) final;
+#endif
+
+#if ENABLE(SANDBOX_EXTENSIONS)
+    void getSandboxExtensionsForBlobFiles(const Vector<String>& filenames, std::function<void (SandboxExtension::HandleArray&&)> completionHandler);
+#endif
+
+private:
+    DatabaseProcess();
+
+    // ChildProcess
+    void initializeProcess(const ChildProcessInitializationParameters&) override;
+    void initializeProcessName(const ChildProcessInitializationParameters&) override;
+    void initializeSandbox(const ChildProcessInitializationParameters&, SandboxInitializationParameters&) override;
+    void initializeConnection(IPC::Connection*) override;
+    bool shouldTerminate() override;
+
+    // IPC::Connection::Client
+    void didReceiveMessage(IPC::Connection&, IPC::Decoder&) override;
+    void didClose(IPC::Connection&) override;
+    void didReceiveDatabaseProcessMessage(IPC::Connection&, IPC::Decoder&);
+
+    // Message Handlers
+    void initializeDatabaseProcess(const DatabaseProcessCreationParameters&);
+    void createDatabaseToWebProcessConnection();
+
+    void fetchWebsiteData(WebCore::SessionID, OptionSet<WebsiteDataType> websiteDataTypes, uint64_t callbackID);
+    void deleteWebsiteData(WebCore::SessionID, OptionSet<WebsiteDataType> websiteDataTypes, std::chrono::system_clock::time_point modifiedSince, uint64_t callbackID);
+    void deleteWebsiteDataForOrigins(WebCore::SessionID, OptionSet<WebsiteDataType> websiteDataTypes, const Vector<WebCore::SecurityOriginData>& origins, uint64_t callbackID);
+#if ENABLE(SANDBOX_EXTENSIONS)
+    void grantSandboxExtensionsForBlobs(const Vector<String>& paths, const SandboxExtension::HandleArray&);
+    void didGetSandboxExtensionsForBlobFiles(uint64_t requestID, SandboxExtension::HandleArray&&);
+#endif
+
+#if ENABLE(INDEXED_DATABASE)
+    Vector<WebCore::SecurityOriginData> indexedDatabaseOrigins();
+#endif
+
+    // For execution on work queue thread only
+    void performNextDatabaseTask();
+    void ensurePathExists(const String&);
+
+    Vector<RefPtr<DatabaseToWebProcessConnection>> m_databaseToWebProcessConnections;
+
+    Ref<WorkQueue> m_queue;
+
+#if ENABLE(INDEXED_DATABASE)
+    String m_indexedDatabaseDirectory;
+    RefPtr<WebCore::IDBServer::IDBServer> m_idbServer;
+#endif
+    HashMap<String, RefPtr<SandboxExtension>> m_blobTemporaryFileSandboxExtensions;
+    HashMap<uint64_t, std::function<void (SandboxExtension::HandleArray&&)>> m_sandboxExtensionForBlobsCompletionHandlers;
+
+    Deque<CrossThreadTask> m_databaseTasks;
+    Lock m_databaseTaskMutex;
+};
+
+} // namespace WebKit
+
+#endif // ENABLE(DATABASE_PROCESS)