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diff --git a/Source/WTF/wtf/WorkQueue.h b/Source/WTF/wtf/WorkQueue.h
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+/*
+ * Copyright (C) 2010, 2015 Apple Inc. All rights reserved.
+ * Portions Copyright (c) 2010 Motorola Mobility, 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 WorkQueue_h
+#define WorkQueue_h
+
+#include <chrono>
+#include <functional>
+#include <wtf/Forward.h>
+#include <wtf/FunctionDispatcher.h>
+#include <wtf/RefCounted.h>
+#include <wtf/Threading.h>
+
+#if USE(COCOA_EVENT_LOOP)
+#include <dispatch/dispatch.h>
+#endif
+
+#if USE(WINDOWS_EVENT_LOOP)
+#include <wtf/Vector.h>
+#endif
+
+#if USE(GLIB_EVENT_LOOP) || USE(GENERIC_EVENT_LOOP)
+#include <wtf/Condition.h>
+#include <wtf/RunLoop.h>
+#endif
+
+namespace WTF {
+
+class WorkQueue final : public FunctionDispatcher {
+public:
+    enum class Type {
+        Serial,
+        Concurrent
+    };
+    enum class QOS {
+        UserInteractive,
+        UserInitiated,
+        Default,
+        Utility,
+        Background
+    };
+
+    WTF_EXPORT_PRIVATE static Ref<WorkQueue> create(const char* name, Type = Type::Serial, QOS = QOS::Default);
+    virtual ~WorkQueue();
+
+    WTF_EXPORT_PRIVATE void dispatch(Function<void ()>&&) override;
+    WTF_EXPORT_PRIVATE void dispatchAfter(std::chrono::nanoseconds, Function<void ()>&&);
+
+    WTF_EXPORT_PRIVATE static void concurrentApply(size_t iterations, const std::function<void (size_t index)>&);
+
+#if USE(COCOA_EVENT_LOOP)
+    dispatch_queue_t dispatchQueue() const { return m_dispatchQueue; }
+#elif USE(GLIB_EVENT_LOOP) || USE(GENERIC_EVENT_LOOP)
+    RunLoop& runLoop() const { return *m_runLoop; }
+#endif
+
+private:
+    explicit WorkQueue(const char* name, Type, QOS);
+
+    void platformInitialize(const char* name, Type, QOS);
+    void platformInvalidate();
+
+#if USE(WINDOWS_EVENT_LOOP)
+    static void CALLBACK timerCallback(void* context, BOOLEAN timerOrWaitFired);
+    static DWORD WINAPI workThreadCallback(void* context);
+
+    bool tryRegisterAsWorkThread();
+    void unregisterAsWorkThread();
+    void performWorkOnRegisteredWorkThread();
+#endif
+
+#if USE(COCOA_EVENT_LOOP)
+    static void executeFunction(void*);
+    dispatch_queue_t m_dispatchQueue;
+#elif USE(WINDOWS_EVENT_LOOP)
+    volatile LONG m_isWorkThreadRegistered;
+
+    Mutex m_functionQueueLock;
+    Vector<Function<void ()>> m_functionQueue;
+
+    HANDLE m_timerQueue;
+#elif USE(GLIB_EVENT_LOOP) || USE(GENERIC_EVENT_LOOP)
+    ThreadIdentifier m_workQueueThread;
+    Lock m_initializeRunLoopConditionMutex;
+    Condition m_initializeRunLoopCondition;
+    RunLoop* m_runLoop;
+#endif
+};
+
+}
+
+using WTF::WorkQueue;
+
+#endif