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diff --git a/Source/WTF/wtf/CrossThreadTask.h b/Source/WTF/wtf/CrossThreadTask.h
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+/*
+ * Copyright (C) 2013, 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
+
+#include <wtf/CrossThreadCopier.h>
+#include <wtf/Function.h>
+#include <wtf/StdLibExtras.h>
+
+namespace WTF {
+
+class CrossThreadTask {
+public:
+    CrossThreadTask() = default;
+
+    CrossThreadTask(Function<void ()>&& taskFunction)
+        : m_taskFunction(WTFMove(taskFunction))
+    {
+        ASSERT(m_taskFunction);
+    }
+
+    void performTask()
+    {
+        m_taskFunction();
+    }
+
+protected:
+    Function<void ()> m_taskFunction;
+};
+
+template <typename T>
+T crossThreadCopy(const T& t)
+{
+    return CrossThreadCopier<T>::copy(t);
+}
+
+template <typename F, typename ArgsTuple, size_t... ArgsIndex>
+void callFunctionForCrossThreadTaskImpl(F function, ArgsTuple&& args, std::index_sequence<ArgsIndex...>)
+{
+    function(std::get<ArgsIndex>(std::forward<ArgsTuple>(args))...);
+}
+
+template <typename F, typename ArgsTuple, typename ArgsIndices = std::make_index_sequence<std::tuple_size<ArgsTuple>::value>>
+void callFunctionForCrossThreadTask(F function, ArgsTuple&& args)
+{
+    callFunctionForCrossThreadTaskImpl(function, std::forward<ArgsTuple>(args), ArgsIndices());
+}
+
+template<typename... Parameters, typename... Arguments>
+CrossThreadTask createCrossThreadTask(void (*method)(Parameters...), const Arguments&... arguments)
+{
+    return CrossThreadTask([method, arguments = std::make_tuple(crossThreadCopy<Arguments>(arguments)...)]() mutable {
+        callFunctionForCrossThreadTask(method, WTFMove(arguments));
+    });
+}
+
+template <typename C, typename MF, typename ArgsTuple, size_t... ArgsIndex>
+void callMemberFunctionForCrossThreadTaskImpl(C* object, MF function, ArgsTuple&& args, std::index_sequence<ArgsIndex...>)
+{
+    (object->*function)(std::get<ArgsIndex>(std::forward<ArgsTuple>(args))...);
+}
+
+template <typename C, typename MF, typename ArgsTuple, typename ArgsIndicies = std::make_index_sequence<std::tuple_size<ArgsTuple>::value>>
+void callMemberFunctionForCrossThreadTask(C* object, MF function, ArgsTuple&& args)
+{
+    callMemberFunctionForCrossThreadTaskImpl(object, function, std::forward<ArgsTuple>(args), ArgsIndicies());
+}
+
+template<typename T, typename... Parameters, typename... Arguments>
+CrossThreadTask createCrossThreadTask(T& callee, void (T::*method)(Parameters...), const Arguments&... arguments)
+{
+    return CrossThreadTask([callee = &callee, method, arguments = std::make_tuple(crossThreadCopy<Arguments>(arguments)...)]() mutable {
+        callMemberFunctionForCrossThreadTask(callee, method, WTFMove(arguments));
+    });
+}
+
+} // namespace WTF
+
+using WTF::CrossThreadTask;
+using WTF::createCrossThreadTask;