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diff --git a/Source/WebCore/bindings/js/JSDOMConvertVariadic.h b/Source/WebCore/bindings/js/JSDOMConvertVariadic.h
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+++ b/Source/WebCore/bindings/js/JSDOMConvertVariadic.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
+
+#include "IDLTypes.h"
+#include "JSDOMConvertBase.h"
+
+namespace WebCore {
+
+namespace Detail {
+
+template<typename IDLType>
+struct VariadicConverterBase;
+
+template<typename IDLType> 
+struct VariadicConverterBase {
+    using Item = typename IDLType::ImplementationType;
+
+    static std::optional<Item> convert(JSC::ExecState& state, JSC::JSValue value)
+    {
+        auto& vm = state.vm();
+        auto scope = DECLARE_THROW_SCOPE(vm);
+
+        auto result = Converter<IDLType>::convert(state, value);
+        RETURN_IF_EXCEPTION(scope, std::nullopt);
+
+        return WTFMove(result);
+    }
+};
+
+template<typename T>
+struct VariadicConverterBase<IDLInterface<T>> {
+    using Item = std::reference_wrapper<T>;
+
+    static std::optional<Item> convert(JSC::ExecState& state, JSC::JSValue value)
+    {
+        auto* result = Converter<IDLInterface<T>>::convert(state, value);
+        if (!result)
+            return std::nullopt;
+        return std::optional<Item>(*result);
+    }
+};
+
+template<typename IDLType>
+struct VariadicConverter : VariadicConverterBase<IDLType> {
+    using Item = typename VariadicConverterBase<IDLType>::Item;
+    using Container = Vector<Item>;
+
+    struct Result {
+        size_t argumentIndex;
+        std::optional<Container> arguments;
+    };
+};
+
+}
+
+template<typename IDLType> typename Detail::VariadicConverter<IDLType>::Result convertVariadicArguments(JSC::ExecState& state, size_t startIndex)
+{
+    size_t length = state.argumentCount();
+    if (startIndex > length)
+        return { 0, std::nullopt };
+
+    typename Detail::VariadicConverter<IDLType>::Container result;
+    result.reserveInitialCapacity(length - startIndex);
+
+    for (size_t i = startIndex; i < length; ++i) {
+        auto value = Detail::VariadicConverter<IDLType>::convert(state, state.uncheckedArgument(i));
+        if (!value)
+            return { i, std::nullopt };
+        result.uncheckedAppend(WTFMove(*value));
+    }
+
+    return { length, WTFMove(result) };
+}
+
+} // namespace WebCore