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diff --git a/Source/WebCore/Modules/indexeddb/client/IDBConnectionToServer.h b/Source/WebCore/Modules/indexeddb/client/IDBConnectionToServer.h
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+++ b/Source/WebCore/Modules/indexeddb/client/IDBConnectionToServer.h
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2015, 2016 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 "IDBConnectionProxy.h"
+#include "IDBConnectionToServerDelegate.h"
+#include "IDBResourceIdentifier.h"
+#include <wtf/HashMap.h>
+#include <wtf/Ref.h>
+#include <wtf/ThreadSafeRefCounted.h>
+
+namespace WebCore {
+
+class IDBCursorInfo;
+class IDBDatabase;
+class IDBError;
+class IDBObjectStoreInfo;
+class IDBResultData;
+class IDBValue;
+class SecurityOrigin;
+
+struct IDBGetAllRecordsData;
+struct IDBGetRecordData;
+struct IDBIterateCursorData;
+
+namespace IDBClient {
+
+class IDBConnectionToServer : public ThreadSafeRefCounted<IDBConnectionToServer> {
+public:
+    WEBCORE_EXPORT static Ref<IDBConnectionToServer> create(IDBConnectionToServerDelegate&);
+
+    uint64_t identifier() const;
+
+    IDBConnectionProxy& proxy();
+
+    void deleteDatabase(const IDBRequestData&);
+    WEBCORE_EXPORT void didDeleteDatabase(const IDBResultData&);
+
+    void openDatabase(const IDBRequestData&);
+    WEBCORE_EXPORT void didOpenDatabase(const IDBResultData&);
+
+    void createObjectStore(const IDBRequestData&, const IDBObjectStoreInfo&);
+    WEBCORE_EXPORT void didCreateObjectStore(const IDBResultData&);
+
+    void deleteObjectStore(const IDBRequestData&, const String& objectStoreName);
+    WEBCORE_EXPORT void didDeleteObjectStore(const IDBResultData&);
+
+    void renameObjectStore(const IDBRequestData&, uint64_t objectStoreIdentifier, const String& newName);
+    WEBCORE_EXPORT void didRenameObjectStore(const IDBResultData&);
+
+    void clearObjectStore(const IDBRequestData&, uint64_t objectStoreIdentifier);
+    WEBCORE_EXPORT void didClearObjectStore(const IDBResultData&);
+
+    void createIndex(const IDBRequestData&, const IDBIndexInfo&);
+    WEBCORE_EXPORT void didCreateIndex(const IDBResultData&);
+
+    void deleteIndex(const IDBRequestData&, uint64_t objectStoreIdentifier, const String& indexName);
+    WEBCORE_EXPORT void didDeleteIndex(const IDBResultData&);
+
+    void renameIndex(const IDBRequestData&, uint64_t objectStoreIdentifier, uint64_t indexIdentifier, const String& newName);
+    WEBCORE_EXPORT void didRenameIndex(const IDBResultData&);
+
+    void putOrAdd(const IDBRequestData&, const IDBKeyData&, const IDBValue&, const IndexedDB::ObjectStoreOverwriteMode);
+    WEBCORE_EXPORT void didPutOrAdd(const IDBResultData&);
+
+    void getRecord(const IDBRequestData&, const IDBGetRecordData&);
+    WEBCORE_EXPORT void didGetRecord(const IDBResultData&);
+
+    void getAllRecords(const IDBRequestData&, const IDBGetAllRecordsData&);
+    WEBCORE_EXPORT void didGetAllRecords(const IDBResultData&);
+
+    void getCount(const IDBRequestData&, const IDBKeyRangeData&);
+    WEBCORE_EXPORT void didGetCount(const IDBResultData&);
+
+    void deleteRecord(const IDBRequestData&, const IDBKeyRangeData&);
+    WEBCORE_EXPORT void didDeleteRecord(const IDBResultData&);
+
+    void openCursor(const IDBRequestData&, const IDBCursorInfo&);
+    WEBCORE_EXPORT void didOpenCursor(const IDBResultData&);
+
+    void iterateCursor(const IDBRequestData&, const IDBIterateCursorData&);
+    WEBCORE_EXPORT void didIterateCursor(const IDBResultData&);
+
+    void commitTransaction(const IDBResourceIdentifier& transactionIdentifier);
+    WEBCORE_EXPORT void didCommitTransaction(const IDBResourceIdentifier& transactionIdentifier, const IDBError&);
+
+    void didFinishHandlingVersionChangeTransaction(uint64_t databaseConnectionIdentifier, const IDBResourceIdentifier&);
+
+    void abortTransaction(const IDBResourceIdentifier& transactionIdentifier);
+    WEBCORE_EXPORT void didAbortTransaction(const IDBResourceIdentifier& transactionIdentifier, const IDBError&);
+
+    WEBCORE_EXPORT void fireVersionChangeEvent(uint64_t databaseConnectionIdentifier, const IDBResourceIdentifier& requestIdentifier, uint64_t requestedVersion);
+    void didFireVersionChangeEvent(uint64_t databaseConnectionIdentifier, const IDBResourceIdentifier& requestIdentifier);
+
+    WEBCORE_EXPORT void didStartTransaction(const IDBResourceIdentifier& transactionIdentifier, const IDBError&);
+
+    WEBCORE_EXPORT void didCloseFromServer(uint64_t databaseConnectionIdentifier, const IDBError&);
+    void confirmDidCloseFromServer(uint64_t databaseConnectionIdentifier);
+
+    WEBCORE_EXPORT void connectionToServerLost(const IDBError&);
+
+    WEBCORE_EXPORT void notifyOpenDBRequestBlocked(const IDBResourceIdentifier& requestIdentifier, uint64_t oldVersion, uint64_t newVersion);
+    void openDBRequestCancelled(const IDBRequestData&);
+
+    void establishTransaction(uint64_t databaseConnectionIdentifier, const IDBTransactionInfo&);
+
+    void databaseConnectionPendingClose(uint64_t databaseConnectionIdentifier);
+    void databaseConnectionClosed(uint64_t databaseConnectionIdentifier);
+
+    // To be used when an IDBOpenDBRequest gets a new database connection, optionally with a
+    // versionchange transaction, but the page is already torn down.
+    void abortOpenAndUpgradeNeeded(uint64_t databaseConnectionIdentifier, const IDBResourceIdentifier& transactionIdentifier);
+
+    void getAllDatabaseNames(const SecurityOrigin& mainFrameOrigin, const SecurityOrigin& openingOrigin, std::function<void (const Vector<String>&)>);
+    WEBCORE_EXPORT void didGetAllDatabaseNames(uint64_t callbackID, const Vector<String>& databaseNames);
+
+private:
+    IDBConnectionToServer(IDBConnectionToServerDelegate&);
+
+    Ref<IDBConnectionToServerDelegate> m_delegate;
+
+    HashMap<uint64_t, std::function<void (const Vector<String>&)>> m_getAllDatabaseNamesCallbacks;
+
+    std::unique_ptr<IDBConnectionProxy> m_proxy;
+};
+
+} // namespace IDBClient
+} // namespace WebCore
+
+#endif // ENABLE(INDEXED_DATABASE)