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diff --git a/Source/WebKit2/NetworkProcess/cache/NetworkCacheSpeculativeLoadManager.h b/Source/WebKit2/NetworkProcess/cache/NetworkCacheSpeculativeLoadManager.h
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+++ b/Source/WebKit2/NetworkProcess/cache/NetworkCacheSpeculativeLoadManager.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.
+ */
+
+#ifndef NetworkCacheSpeculativeLoadManager_h
+#define NetworkCacheSpeculativeLoadManager_h
+
+#if ENABLE(NETWORK_CACHE_SPECULATIVE_REVALIDATION)
+
+#include "NetworkCache.h"
+#include "NetworkCacheStorage.h"
+#include <WebCore/ResourceRequest.h>
+#include <wtf/HashMap.h>
+#include <wtf/Vector.h>
+
+namespace WebKit {
+
+namespace NetworkCache {
+
+class Entry;
+class SpeculativeLoad;
+class SubresourceInfo;
+class SubresourcesEntry;
+
+class SpeculativeLoadManager {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    explicit SpeculativeLoadManager(Storage&);
+    ~SpeculativeLoadManager();
+
+    void registerLoad(const GlobalFrameID&, const WebCore::ResourceRequest&, const Key& resourceKey);
+
+    typedef Function<void (std::unique_ptr<Entry>)> RetrieveCompletionHandler;
+
+    bool canRetrieve(const Key& storageKey, const WebCore::ResourceRequest&, const GlobalFrameID&) const;
+    void retrieve(const Key& storageKey, RetrieveCompletionHandler&&);
+
+private:
+    class PreloadedEntry;
+
+    void addPreloadedEntry(std::unique_ptr<Entry>, const GlobalFrameID&, std::optional<WebCore::ResourceRequest>&& revalidationRequest = std::nullopt);
+    void preloadEntry(const Key&, const SubresourceInfo&, const GlobalFrameID&);
+    void retrieveEntryFromStorage(const SubresourceInfo&, RetrieveCompletionHandler&&);
+    void revalidateSubresource(const SubresourceInfo&, std::unique_ptr<Entry>, const GlobalFrameID&);
+    bool satisfyPendingRequests(const Key&, Entry*);
+    void retrieveSubresourcesEntry(const Key& storageKey, std::function<void (std::unique_ptr<SubresourcesEntry>)>&&);
+    void startSpeculativeRevalidation(const GlobalFrameID&, SubresourcesEntry&);
+
+    static bool canUsePreloadedEntry(const PreloadedEntry&, const WebCore::ResourceRequest& actualRequest);
+    static bool canUsePendingPreload(const SpeculativeLoad&, const WebCore::ResourceRequest& actualRequest);
+
+    Storage& m_storage;
+
+    class PendingFrameLoad;
+    HashMap<GlobalFrameID, RefPtr<PendingFrameLoad>> m_pendingFrameLoads;
+
+    HashMap<Key, std::unique_ptr<SpeculativeLoad>> m_pendingPreloads;
+    HashMap<Key, std::unique_ptr<Vector<RetrieveCompletionHandler>>> m_pendingRetrieveRequests;
+
+    HashMap<Key, std::unique_ptr<PreloadedEntry>> m_preloadedEntries;
+
+    class ExpiringEntry;
+    HashMap<Key, std::unique_ptr<ExpiringEntry>> m_notPreloadedEntries; // For logging.
+};
+
+} // namespace NetworkCache
+
+} // namespace WebKit
+
+#endif // ENABLE(NETWORK_CACHE_SPECULATIVE_REVALIDATION)
+
+#endif // NetworkCacheSpeculativeLoadManager_h