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diff --git a/Source/WebCore/bindings/js/BufferSource.h b/Source/WebCore/bindings/js/BufferSource.h
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+++ b/Source/WebCore/bindings/js/BufferSource.h
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+/*
+ * Copyright (C) 2016 Igalia S.L.
+ *
+ * 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 <runtime/ArrayBuffer.h>
+#include <runtime/ArrayBufferView.h>
+#include <wtf/RefPtr.h>
+#include <wtf/Variant.h>
+
+namespace WebCore {
+
+class BufferSource {
+public:
+    using VariantType = WTF::Variant<RefPtr<JSC::ArrayBufferView>, RefPtr<JSC::ArrayBuffer>>;
+
+    BufferSource() { }
+    BufferSource(VariantType&& variant)
+        : m_variant(WTFMove(variant))
+    { }
+
+    const VariantType& variant() const { return m_variant; }
+
+    const uint8_t* data() const
+    {
+        return WTF::visit([](auto& buffer) -> const uint8_t* {
+            return static_cast<const uint8_t*>(buffer->data());
+        }, m_variant);
+    }
+
+    size_t length() const
+    {
+        return WTF::visit([](auto& buffer) -> size_t {
+            return buffer->byteLength();
+        }, m_variant);
+    }
+
+private:
+    VariantType m_variant;
+};
+
+} // namespace WebCore