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diff --git a/Source/WebKit2/DatabaseProcess/DatabaseProcess.cpp b/Source/WebKit2/DatabaseProcess/DatabaseProcess.cpp
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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.
+ */
+
+#include "config.h"
+#include "DatabaseProcess.h"
+
+#if ENABLE(DATABASE_PROCESS)
+
+#include "DatabaseProcessCreationParameters.h"
+#include "DatabaseProcessMessages.h"
+#include "DatabaseProcessProxyMessages.h"
+#include "DatabaseToWebProcessConnection.h"
+#include "WebCrossThreadCopier.h"
+#include "WebsiteData.h"
+#include <WebCore/CrossThreadTask.h>
+#include <WebCore/FileSystem.h>
+#include <WebCore/NotImplemented.h>
+#include <WebCore/SessionID.h>
+#include <WebCore/TextEncoding.h>
+#include <wtf/MainThread.h>
+
+using namespace WebCore;
+
+namespace WebKit {
+
+DatabaseProcess& DatabaseProcess::singleton()
+{
+    static NeverDestroyed<DatabaseProcess> databaseProcess;
+    return databaseProcess;
+}
+
+DatabaseProcess::DatabaseProcess()
+    : m_queue(WorkQueue::create("com.apple.WebKit.DatabaseProcess"))
+{
+    // Make sure the UTF8Encoding encoding and the text encoding maps have been built on the main thread before a background thread needs it.
+    // FIXME: https://bugs.webkit.org/show_bug.cgi?id=135365 - Need a more explicit way of doing this besides accessing the UTF8Encoding.
+    UTF8Encoding();
+}
+
+DatabaseProcess::~DatabaseProcess()
+{
+}
+
+void DatabaseProcess::initializeConnection(IPC::Connection* connection)
+{
+    ChildProcess::initializeConnection(connection);
+}
+
+bool DatabaseProcess::shouldTerminate()
+{
+    return true;
+}
+
+void DatabaseProcess::didClose(IPC::Connection&)
+{
+    RunLoop::current().stop();
+}
+
+void DatabaseProcess::didReceiveMessage(IPC::Connection& connection, IPC::MessageDecoder& decoder)
+{
+    if (messageReceiverMap().dispatchMessage(connection, decoder))
+        return;
+
+    if (decoder.messageReceiverName() == Messages::DatabaseProcess::messageReceiverName()) {
+        didReceiveDatabaseProcessMessage(connection, decoder);
+        return;
+    }
+}
+
+void DatabaseProcess::didReceiveInvalidMessage(IPC::Connection&, IPC::StringReference, IPC::StringReference)
+{
+    RunLoop::current().stop();
+}
+
+#if ENABLE(INDEXED_DATABASE)
+IDBServer::IDBServer& DatabaseProcess::idbServer()
+{
+    if (!m_idbServer)
+        m_idbServer = IDBServer::IDBServer::create(indexedDatabaseDirectory());
+
+    return *m_idbServer;
+}
+#endif
+
+void DatabaseProcess::initializeDatabaseProcess(const DatabaseProcessCreationParameters& parameters)
+{
+#if ENABLE(INDEXED_DATABASE)
+    // *********
+    // IMPORTANT: Do not change the directory structure for indexed databases on disk without first consulting a reviewer from Apple (<rdar://problem/17454712>)
+    // *********
+
+    m_indexedDatabaseDirectory = parameters.indexedDatabaseDirectory;
+    SandboxExtension::consumePermanently(parameters.indexedDatabaseDirectoryExtensionHandle);
+
+    ensureIndexedDatabaseRelativePathExists(StringImpl::empty());
+#endif
+}
+
+#if ENABLE(INDEXED_DATABASE)
+void DatabaseProcess::ensureIndexedDatabaseRelativePathExists(const String& relativePath)
+{
+    postDatabaseTask(createCrossThreadTask(*this, &DatabaseProcess::ensurePathExists, absoluteIndexedDatabasePathFromDatabaseRelativePath(relativePath)));
+}
+#endif
+
+void DatabaseProcess::ensurePathExists(const String& path)
+{
+    ASSERT(!RunLoop::isMain());
+
+    if (!makeAllDirectories(path))
+        LOG_ERROR("Failed to make all directories for path '%s'", path.utf8().data());
+}
+
+#if ENABLE(INDEXED_DATABASE)
+String DatabaseProcess::absoluteIndexedDatabasePathFromDatabaseRelativePath(const String& relativePath)
+{
+    // FIXME: pathByAppendingComponent() was originally designed to append individual atomic components.
+    // We don't have a function designed to append a multi-component subpath, but we should.
+    return pathByAppendingComponent(m_indexedDatabaseDirectory, relativePath);
+}
+#endif
+
+void DatabaseProcess::postDatabaseTask(std::unique_ptr<CrossThreadTask> task)
+{
+    ASSERT(RunLoop::isMain());
+
+    LockHolder locker(m_databaseTaskMutex);
+
+    m_databaseTasks.append(WTFMove(task));
+
+    m_queue->dispatch([this] {
+        performNextDatabaseTask();
+    });
+}
+
+void DatabaseProcess::performNextDatabaseTask()
+{
+    ASSERT(!RunLoop::isMain());
+
+    std::unique_ptr<CrossThreadTask> task;
+    {
+        LockHolder locker(m_databaseTaskMutex);
+        ASSERT(!m_databaseTasks.isEmpty());
+        task = m_databaseTasks.takeFirst();
+    }
+
+    task->performTask();
+}
+
+void DatabaseProcess::createDatabaseToWebProcessConnection()
+{
+#if USE(UNIX_DOMAIN_SOCKETS)
+    IPC::Connection::SocketPair socketPair = IPC::Connection::createPlatformConnection();
+    m_databaseToWebProcessConnections.append(DatabaseToWebProcessConnection::create(socketPair.server));
+    parentProcessConnection()->send(Messages::DatabaseProcessProxy::DidCreateDatabaseToWebProcessConnection(IPC::Attachment(socketPair.client)), 0);
+#elif OS(DARWIN)
+    // Create the listening port.
+    mach_port_t listeningPort;
+    mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_RECEIVE, &listeningPort);
+
+    // Create a listening connection.
+    RefPtr<DatabaseToWebProcessConnection> connection = DatabaseToWebProcessConnection::create(IPC::Connection::Identifier(listeningPort));
+    m_databaseToWebProcessConnections.append(connection.release());
+
+    IPC::Attachment clientPort(listeningPort, MACH_MSG_TYPE_MAKE_SEND);
+    parentProcessConnection()->send(Messages::DatabaseProcessProxy::DidCreateDatabaseToWebProcessConnection(clientPort), 0);
+#else
+    notImplemented();
+#endif
+}
+
+void DatabaseProcess::fetchWebsiteData(SessionID, uint64_t websiteDataTypes, uint64_t callbackID)
+{
+    struct CallbackAggregator final : public ThreadSafeRefCounted<CallbackAggregator> {
+        explicit CallbackAggregator(std::function<void (WebsiteData)> completionHandler)
+            : m_completionHandler(WTFMove(completionHandler))
+        {
+        }
+
+        ~CallbackAggregator()
+        {
+            ASSERT(RunLoop::isMain());
+
+            auto completionHandler = WTFMove(m_completionHandler);
+            auto websiteData = WTFMove(m_websiteData);
+
+            RunLoop::main().dispatch([completionHandler, websiteData] {
+                completionHandler(websiteData);
+            });
+        }
+
+        std::function<void (WebsiteData)> m_completionHandler;
+        WebsiteData m_websiteData;
+    };
+
+    RefPtr<CallbackAggregator> callbackAggregator = adoptRef(new CallbackAggregator([this, callbackID](WebsiteData websiteData) {
+        parentProcessConnection()->send(Messages::DatabaseProcessProxy::DidFetchWebsiteData(callbackID, websiteData), 0);
+    }));
+
+#if ENABLE(INDEXED_DATABASE)
+    if (websiteDataTypes & WebsiteDataTypeIndexedDBDatabases) {
+        // FIXME: Pick the right database store based on the session ID.
+        postDatabaseTask(std::make_unique<CrossThreadTask>([callbackAggregator, websiteDataTypes, this] {
+
+            Vector<RefPtr<SecurityOrigin>> securityOrigins = indexedDatabaseOrigins();
+
+            RunLoop::main().dispatch([callbackAggregator, securityOrigins] {
+                for (const auto& securityOrigin : securityOrigins)
+                    callbackAggregator->m_websiteData.entries.append(WebsiteData::Entry { securityOrigin, WebsiteDataTypeIndexedDBDatabases });
+            });
+        }));
+    }
+#endif
+}
+
+void DatabaseProcess::deleteWebsiteData(WebCore::SessionID, uint64_t websiteDataTypes, std::chrono::system_clock::time_point modifiedSince, uint64_t callbackID)
+{
+    struct CallbackAggregator final : public ThreadSafeRefCounted<CallbackAggregator> {
+        explicit CallbackAggregator(std::function<void ()> completionHandler)
+            : m_completionHandler(WTFMove(completionHandler))
+        {
+        }
+
+        ~CallbackAggregator()
+        {
+            ASSERT(RunLoop::isMain());
+
+            RunLoop::main().dispatch(WTFMove(m_completionHandler));
+        }
+
+        std::function<void ()> m_completionHandler;
+    };
+
+    RefPtr<CallbackAggregator> callbackAggregator = adoptRef(new CallbackAggregator([this, callbackID]() {
+        parentProcessConnection()->send(Messages::DatabaseProcessProxy::DidDeleteWebsiteData(callbackID), 0);
+    }));
+
+#if ENABLE(INDEXED_DATABASE)
+    if (websiteDataTypes & WebsiteDataTypeIndexedDBDatabases) {
+        postDatabaseTask(std::make_unique<CrossThreadTask>([this, callbackAggregator, modifiedSince] {
+
+            deleteIndexedDatabaseEntriesModifiedSince(modifiedSince);
+            RunLoop::main().dispatch([callbackAggregator] { });
+        }));
+    }
+#endif
+}
+
+void DatabaseProcess::deleteWebsiteDataForOrigins(WebCore::SessionID, uint64_t websiteDataTypes, const Vector<SecurityOriginData>& securityOriginDatas, uint64_t callbackID)
+{
+    struct CallbackAggregator final : public ThreadSafeRefCounted<CallbackAggregator> {
+        explicit CallbackAggregator(std::function<void ()> completionHandler)
+            : m_completionHandler(WTFMove(completionHandler))
+        {
+        }
+
+        ~CallbackAggregator()
+        {
+            ASSERT(RunLoop::isMain());
+
+            RunLoop::main().dispatch(WTFMove(m_completionHandler));
+        }
+
+        std::function<void ()> m_completionHandler;
+    };
+
+    RefPtr<CallbackAggregator> callbackAggregator = adoptRef(new CallbackAggregator([this, callbackID]() {
+        parentProcessConnection()->send(Messages::DatabaseProcessProxy::DidDeleteWebsiteDataForOrigins(callbackID), 0);
+    }));
+
+#if ENABLE(INDEXED_DATABASE)
+    if (websiteDataTypes & WebsiteDataTypeIndexedDBDatabases) {
+        Vector<RefPtr<WebCore::SecurityOrigin>> securityOrigins;
+        for (const auto& securityOriginData : securityOriginDatas)
+            securityOrigins.append(securityOriginData.securityOrigin());
+
+        postDatabaseTask(std::make_unique<CrossThreadTask>([this, securityOrigins, callbackAggregator] {
+            deleteIndexedDatabaseEntriesForOrigins(securityOrigins);
+
+            RunLoop::main().dispatch([callbackAggregator] { });
+        }));
+    }
+#endif
+}
+
+#if ENABLE(INDEXED_DATABASE)
+Vector<RefPtr<WebCore::SecurityOrigin>> DatabaseProcess::indexedDatabaseOrigins()
+{
+    if (m_indexedDatabaseDirectory.isEmpty())
+        return { };
+
+    Vector<RefPtr<WebCore::SecurityOrigin>> securityOrigins;
+    for (auto& originPath : listDirectory(m_indexedDatabaseDirectory, "*")) {
+        String databaseIdentifier = pathGetFileName(originPath);
+
+        if (auto securityOrigin = SecurityOrigin::maybeCreateFromDatabaseIdentifier(databaseIdentifier))
+            securityOrigins.append(WTFMove(securityOrigin));
+    }
+
+    return securityOrigins;
+}
+#endif
+
+#if ENABLE(INDEXED_DATABASE)
+static void removeAllDatabasesForOriginPath(const String& originPath, std::chrono::system_clock::time_point modifiedSince)
+{
+    // FIXME: We should also close/invalidate any live handles to the database files we are about to delete.
+    // Right now:
+    //     - For read-only operations, they will continue functioning as normal on the unlinked file.
+    //     - For write operations, they will start producing errors as SQLite notices the missing backing store.
+    // This is tracked by https://bugs.webkit.org/show_bug.cgi?id=135347
+
+    Vector<String> databasePaths = listDirectory(originPath, "*");
+
+    for (auto& databasePath : databasePaths) {
+        String databaseFile = pathByAppendingComponent(databasePath, "IndexedDB.sqlite3");
+
+        if (!fileExists(databaseFile))
+            continue;
+
+        if (modifiedSince > std::chrono::system_clock::time_point::min()) {
+            time_t modificationTime;
+            if (!getFileModificationTime(databaseFile, modificationTime))
+                continue;
+
+            if (std::chrono::system_clock::from_time_t(modificationTime) < modifiedSince)
+                continue;
+        }
+
+        deleteFile(databaseFile);
+        deleteEmptyDirectory(databasePath);
+    }
+
+    deleteEmptyDirectory(originPath);
+}
+
+void DatabaseProcess::deleteIndexedDatabaseEntriesForOrigins(const Vector<RefPtr<WebCore::SecurityOrigin>>& securityOrigins)
+{
+    if (m_indexedDatabaseDirectory.isEmpty())
+        return;
+
+    for (const auto& securityOrigin : securityOrigins) {
+        String originPath = pathByAppendingComponent(m_indexedDatabaseDirectory, securityOrigin->databaseIdentifier());
+
+        removeAllDatabasesForOriginPath(originPath, std::chrono::system_clock::time_point::min());
+    }
+}
+
+void DatabaseProcess::deleteIndexedDatabaseEntriesModifiedSince(std::chrono::system_clock::time_point modifiedSince)
+{
+    if (m_indexedDatabaseDirectory.isEmpty())
+        return;
+
+    Vector<String> originPaths = listDirectory(m_indexedDatabaseDirectory, "*");
+    for (auto& originPath : originPaths)
+        removeAllDatabasesForOriginPath(originPath, modifiedSince);
+}
+#endif
+
+#if !PLATFORM(COCOA)
+void DatabaseProcess::initializeProcess(const ChildProcessInitializationParameters&)
+{
+}
+
+void DatabaseProcess::initializeProcessName(const ChildProcessInitializationParameters&)
+{
+}
+
+void DatabaseProcess::initializeSandbox(const ChildProcessInitializationParameters&, SandboxInitializationParameters&)
+{
+}
+#endif
+
+} // namespace WebKit
+
+#endif // ENABLE(DATABASE_PROCESS)