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diff --git a/Source/WebCore/bindings/js/JSDOMConvertInterface.h b/Source/WebCore/bindings/js/JSDOMConvertInterface.h
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+++ b/Source/WebCore/bindings/js/JSDOMConvertInterface.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"
+#include "JSDOMExceptionHandling.h"
+
+namespace WebCore {
+
+template<typename ImplementationClass> struct JSDOMWrapperConverterTraits;
+
+template<typename T> struct Converter<IDLInterface<T>> : DefaultConverter<IDLInterface<T>> {
+    using ReturnType = typename JSDOMWrapperConverterTraits<T>::ToWrappedReturnType;
+    using WrapperType = typename JSDOMWrapperConverterTraits<T>::WrapperClass;
+
+    template<typename ExceptionThrower = DefaultExceptionThrower>
+    static ReturnType convert(JSC::ExecState& state, JSC::JSValue value, ExceptionThrower&& exceptionThrower = ExceptionThrower())
+    {
+        auto& vm = state.vm();
+        auto scope = DECLARE_THROW_SCOPE(vm);
+        ReturnType object = WrapperType::toWrapped(vm, value);
+        if (UNLIKELY(!object))
+            exceptionThrower(state, scope);
+        return object;
+    }
+};
+
+namespace Detail {
+
+template <typename T> inline T* getPtrOrRef(const T* p) { return const_cast<T*>(p); }
+template <typename T> inline T& getPtrOrRef(const T& p) { return const_cast<T&>(p); }
+template <typename T> inline T* getPtrOrRef(const RefPtr<T>& p) { return p.get(); }
+template <typename T> inline T& getPtrOrRef(const Ref<T>& p) { return p.get(); }
+
+}
+
+template<typename T> struct JSConverter<IDLInterface<T>> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    template <typename U>
+    static JSC::JSValue convert(JSC::ExecState& state, JSDOMGlobalObject& globalObject, const U& value)
+    {
+        return toJS(&state, &globalObject, Detail::getPtrOrRef(value));
+    }
+
+    template<typename U>
+    static JSC::JSValue convertNewlyCreated(JSC::ExecState& state, JSDOMGlobalObject& globalObject, U&& value)
+    {
+        return toJSNewlyCreated(&state, &globalObject, std::forward<U>(value));
+    }
+};
+
+
+} // namespace WebCore