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diff --git a/Source/WebKit2/NetworkProcess/capture/NetworkCaptureManager.h b/Source/WebKit2/NetworkProcess/capture/NetworkCaptureManager.h
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+++ b/Source/WebKit2/NetworkProcess/capture/NetworkCaptureManager.h
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+/*
+ * Copyright (C) 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(NETWORK_CAPTURE)
+
+#include <WebCore/FileHandle.h>
+#include <WebCore/FileSystem.h>
+#include <WebCore/URLParser.h>
+#include <wtf/Function.h>
+#include <wtf/NeverDestroyed.h>
+#include <wtf/Vector.h>
+#include <wtf/text/WTFString.h>
+
+namespace WebCore {
+class ResourceRequest;
+}
+
+namespace WebKit {
+namespace NetworkCapture {
+
+class Resource;
+
+/*
+ * NetworkCapture::Manager serves three purposes:
+ *
+ *  * It keeps the state of whether we are recording, replaying, or neither.
+ *  * It keeps the list of cached resources (if replaying), performs fuzzy
+ *    matching on them.
+ *  * It has utilities for logging and file management.
+ *
+ * TODO: Perhaps we should break this up into three classes?
+ */
+class Manager {
+    WTF_MAKE_NONCOPYABLE(Manager);
+    friend class WTF::NeverDestroyed<Manager>;
+
+public:
+    enum RecordReplayMode {
+        Disabled,
+        Record,
+        Replay
+    };
+
+    static Manager& singleton();
+
+    void initialize(const String& recordReplayMode, const String& recordReplayCacheLocation);
+    void terminate();
+
+    bool isRecording() const { return mode() == RecordReplayMode::Record; }
+    bool isReplaying() const { return mode() == RecordReplayMode::Replay; }
+    RecordReplayMode mode() const { return m_recordReplayMode; }
+
+    Resource* findMatch(const WebCore::ResourceRequest&);
+
+    void logRecordedResource(const WebCore::ResourceRequest&);
+    void logLoadedResource(Resource&);
+    void logPlayedBackResource(const WebCore::ResourceRequest&, bool wasCacheMiss);
+
+    WebCore::FileHandle openCacheFile(const String&, WebCore::FileOpenMode);
+
+    String requestToPath(const WebCore::ResourceRequest&);
+    static String urlIdentifyingCommonDomain(const WebCore::URL&);
+
+private:
+    Manager() = default;
+    ~Manager() = delete;
+
+    Resource* findExactMatch(const WebCore::ResourceRequest&);
+    Resource* findBestFuzzyMatch(const WebCore::ResourceRequest&);
+    int fuzzyMatchURLs(const WebCore::URL& requestURL, const WebCore::URLParser::URLEncodedForm& requestParameters, const WebCore::URL& resourceURL, const WebCore::URLParser::URLEncodedForm& resourceParameters);
+
+    void loadResources();
+
+    String reportLoadPath();
+    String reportRecordPath();
+    String reportReplayPath();
+
+    String stringToHash(const String&);
+    String hashToPath(const String& hash);
+
+    std::optional<Vector<Vector<String>>> readFile(const String& filePath);
+    bool getLine(uint8_t const *& p, uint8_t const * const end, Vector<String>& line);
+    bool getWord(uint8_t const *& p, uint8_t const * const end, String& word);
+
+    RecordReplayMode m_recordReplayMode { Disabled };
+    String m_recordReplayCacheLocation;
+
+    WebCore::FileHandle m_loadFileHandle;
+    WebCore::FileHandle m_recordFileHandle;
+    WebCore::FileHandle m_replayFileHandle;
+
+    Vector<Resource> m_cachedResources;
+};
+
+} // namespace NetworkCapture
+} // namespace WebKit
+
+#endif // ENABLE(NETWORK_CAPTURE)