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diff --git a/Source/WebCore/bindings/js/JSDOMConvertSequences.h b/Source/WebCore/bindings/js/JSDOMConvertSequences.h
new file mode 100644
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+++ b/Source/WebCore/bindings/js/JSDOMConvertSequences.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 <runtime/IteratorOperations.h>
+#include <runtime/JSArray.h>
+#include <runtime/JSGlobalObjectInlines.h>
+
+namespace WebCore {
+
+namespace Detail {
+
+template<typename IDLType>
+struct GenericSequenceConverter {
+    using ReturnType = Vector<typename IDLType::ImplementationType>;
+
+    static ReturnType convert(JSC::ExecState& state, JSC::JSObject* jsObject)
+    {
+        ReturnType result;
+        forEachInIterable(&state, jsObject, [&result](JSC::VM& vm, JSC::ExecState* state, JSC::JSValue jsValue) {
+            auto scope = DECLARE_THROW_SCOPE(vm);
+
+            auto convertedValue = Converter<IDLType>::convert(*state, jsValue);
+            if (UNLIKELY(scope.exception()))
+                return;
+            result.append(WTFMove(convertedValue));
+        });
+        return result;
+    }
+};
+
+// Specialization for numeric types
+// FIXME: This is only implemented for the IDLFloatingPointTypes and IDLLong. To add
+// support for more numeric types, add an overload of Converter<IDLType>::convert that
+// takes an ExecState, ThrowScope, double as its arguments.
+template<typename IDLType>
+struct NumericSequenceConverter {
+    using GenericConverter = GenericSequenceConverter<IDLType>;
+    using ReturnType = typename GenericConverter::ReturnType;
+
+    static ReturnType convert(JSC::ExecState& state, JSC::JSValue value)
+    {
+        auto& vm = state.vm();
+        auto scope = DECLARE_THROW_SCOPE(vm);
+
+        if (!value.isObject()) {
+            throwSequenceTypeError(state, scope);
+            return { };
+        }
+
+        JSC::JSObject* object = JSC::asObject(value);
+        if (!JSC::isJSArray(object))
+            return GenericConverter::convert(state, object);
+
+        JSC::JSArray* array = JSC::asArray(object);
+        if (!array->globalObject()->isArrayIteratorProtocolFastAndNonObservable())
+            return GenericConverter::convert(state, object);
+
+        unsigned length = array->length();
+
+        ReturnType result;
+        if (!result.tryReserveCapacity(length)) {
+            // FIXME: Is the right exception to throw?
+            throwTypeError(&state, scope);
+            return { };
+        }
+
+        JSC::IndexingType indexingType = array->indexingType() & JSC::IndexingShapeMask;
+
+        if (indexingType == JSC::ContiguousShape) {
+            for (unsigned i = 0; i < length; i++) {
+                auto indexValue = array->butterfly()->contiguous()[i].get();
+                if (!indexValue)
+                    result.uncheckedAppend(0);
+                else {
+                    auto convertedValue = Converter<IDLType>::convert(state, indexValue);
+                    RETURN_IF_EXCEPTION(scope, { });
+
+                    result.uncheckedAppend(convertedValue);
+                }
+            }
+            return result;
+        }
+        
+        if (indexingType == JSC::Int32Shape) {
+            for (unsigned i = 0; i < length; i++) {
+                auto indexValue = array->butterfly()->contiguousInt32()[i].get();
+                ASSERT(!indexValue || indexValue.isInt32());
+                if (!indexValue)
+                    result.uncheckedAppend(0);
+                else
+                    result.uncheckedAppend(indexValue.asInt32());
+            }
+            return result;
+        }
+
+        if (indexingType == JSC::DoubleShape) {
+            for (unsigned i = 0; i < length; i++) {
+                auto doubleValue = array->butterfly()->contiguousDouble()[i];
+                if (std::isnan(doubleValue))
+                    result.uncheckedAppend(0);
+                else {
+                    auto convertedValue = Converter<IDLType>::convert(state, scope, doubleValue);
+                    RETURN_IF_EXCEPTION(scope, { });
+
+                    result.uncheckedAppend(convertedValue);
+                }
+            }
+            return result;
+        }
+
+        for (unsigned i = 0; i < length; i++) {
+            auto indexValue = array->getDirectIndex(&state, i);
+            RETURN_IF_EXCEPTION(scope, { });
+            
+            if (!indexValue)
+                result.uncheckedAppend(0);
+            else {
+                auto convertedValue = Converter<IDLType>::convert(state, indexValue);
+                RETURN_IF_EXCEPTION(scope, { });
+                
+                result.uncheckedAppend(convertedValue);
+            }
+        }
+        return result;
+    }
+};
+
+template<typename IDLType>
+struct SequenceConverter {
+    using GenericConverter = GenericSequenceConverter<IDLType>;
+    using ReturnType = typename GenericConverter::ReturnType;
+
+    static ReturnType convert(JSC::ExecState& state, JSC::JSValue value)
+    {
+        auto& vm = state.vm();
+        auto scope = DECLARE_THROW_SCOPE(vm);
+
+        if (!value.isObject()) {
+            throwSequenceTypeError(state, scope);
+            return { };
+        }
+
+        JSC::JSObject* object = JSC::asObject(value);
+        if (!JSC::isJSArray(object))
+            return GenericConverter::convert(state, object);
+
+        JSC::JSArray* array = JSC::asArray(object);
+        if (!array->globalObject()->isArrayIteratorProtocolFastAndNonObservable())
+            return GenericConverter::convert(state, object);
+
+        unsigned length = array->length();
+
+        ReturnType result;
+        if (!result.tryReserveCapacity(length)) {
+            // FIXME: Is the right exception to throw?
+            throwTypeError(&state, scope);
+            return { };
+        }
+
+        JSC::IndexingType indexingType = array->indexingType() & JSC::IndexingShapeMask;
+
+        if (indexingType == JSC::ContiguousShape) {
+            for (unsigned i = 0; i < length; i++) {
+                auto indexValue = array->butterfly()->contiguous()[i].get();
+                if (!indexValue)
+                    indexValue = JSC::jsUndefined();
+
+                auto convertedValue = Converter<IDLType>::convert(state, indexValue);
+                RETURN_IF_EXCEPTION(scope, { });
+
+                result.uncheckedAppend(convertedValue);
+            }
+            return result;
+        }
+
+        for (unsigned i = 0; i < length; i++) {
+            auto indexValue = array->getDirectIndex(&state, i);
+            RETURN_IF_EXCEPTION(scope, { });
+
+            if (!indexValue)
+                indexValue = JSC::jsUndefined();
+
+            auto convertedValue = Converter<IDLType>::convert(state, indexValue);
+            RETURN_IF_EXCEPTION(scope, { });
+            
+            result.uncheckedAppend(convertedValue);
+        }
+        return result;
+    }
+};
+
+template<>
+struct SequenceConverter<IDLLong> {
+    using ReturnType = typename GenericSequenceConverter<IDLLong>::ReturnType;
+
+    static ReturnType convert(JSC::ExecState& state, JSC::JSValue value)
+    {
+        return NumericSequenceConverter<IDLLong>::convert(state, value);
+    }
+};
+
+template<>
+struct SequenceConverter<IDLFloat> {
+    using ReturnType = typename GenericSequenceConverter<IDLFloat>::ReturnType;
+
+    static ReturnType convert(JSC::ExecState& state, JSC::JSValue value)
+    {
+        return NumericSequenceConverter<IDLFloat>::convert(state, value);
+    }
+};
+
+template<>
+struct SequenceConverter<IDLUnrestrictedFloat> {
+    using ReturnType = typename GenericSequenceConverter<IDLUnrestrictedFloat>::ReturnType;
+
+    static ReturnType convert(JSC::ExecState& state, JSC::JSValue value)
+    {
+        return NumericSequenceConverter<IDLUnrestrictedFloat>::convert(state, value);
+    }
+};
+
+template<>
+struct SequenceConverter<IDLDouble> {
+    using ReturnType = typename GenericSequenceConverter<IDLDouble>::ReturnType;
+
+    static ReturnType convert(JSC::ExecState& state, JSC::JSValue value)
+    {
+        return NumericSequenceConverter<IDLDouble>::convert(state, value);
+    }
+};
+
+template<>
+struct SequenceConverter<IDLUnrestrictedDouble> {
+    using ReturnType = typename GenericSequenceConverter<IDLUnrestrictedDouble>::ReturnType;
+
+    static ReturnType convert(JSC::ExecState& state, JSC::JSValue value)
+    {
+        return NumericSequenceConverter<IDLUnrestrictedDouble>::convert(state, value);
+    }
+};
+
+}
+
+template<typename T> struct Converter<IDLSequence<T>> : DefaultConverter<IDLSequence<T>> {
+    using ReturnType = typename Detail::SequenceConverter<T>::ReturnType;
+
+    static ReturnType convert(JSC::ExecState& state, JSC::JSValue value)
+    {
+        return Detail::SequenceConverter<T>::convert(state, value);
+    }
+};
+
+template<typename T> struct JSConverter<IDLSequence<T>> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    template<typename U, size_t inlineCapacity>
+    static JSC::JSValue convert(JSC::ExecState& exec, JSDOMGlobalObject& globalObject, const Vector<U, inlineCapacity>& vector)
+    {
+        JSC::MarkedArgumentBuffer list;
+        for (auto& element : vector)
+            list.append(toJS<T>(exec, globalObject, element));
+        return JSC::constructArray(&exec, nullptr, &globalObject, list);
+    }
+};
+
+template<typename T> struct Converter<IDLFrozenArray<T>> : DefaultConverter<IDLFrozenArray<T>> {
+    using ReturnType = typename Detail::SequenceConverter<T>::ReturnType;
+
+    static ReturnType convert(JSC::ExecState& state, JSC::JSValue value)
+    {
+        return Detail::SequenceConverter<T>::convert(state, value);
+    }
+};
+
+template<typename T> struct JSConverter<IDLFrozenArray<T>> {
+    static constexpr bool needsState = true;
+    static constexpr bool needsGlobalObject = true;
+
+    template<typename U, size_t inlineCapacity>
+    static JSC::JSValue convert(JSC::ExecState& exec, JSDOMGlobalObject& globalObject, const Vector<U, inlineCapacity>& vector)
+    {
+        JSC::MarkedArgumentBuffer list;
+        for (auto& element : vector)
+            list.append(toJS<T>(exec, globalObject, element));
+        auto* array = JSC::constructArray(&exec, nullptr, &globalObject, list);
+        return JSC::objectConstructorFreeze(&exec, array);
+    }
+};
+
+} // namespace WebCore