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diff --git a/Source/WebCore/dom/Exception.h b/Source/WebCore/dom/Exception.h
new file mode 100644
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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 <wtf/text/WTFString.h>
+
+namespace WebCore {
+
+using ExceptionCode = int;
+
+class Exception {
+public:
+    explicit Exception(ExceptionCode, String&& = { });
+
+    ExceptionCode code() const { return m_code; }
+    const String& message() const { return m_message; }
+    String&& releaseMessage() { return WTFMove(m_message); }
+
+private:
+    ExceptionCode m_code;
+    String m_message;
+};
+
+Exception isolatedCopy(Exception&&);
+
+inline Exception::Exception(ExceptionCode code, String&& message)
+    : m_code(code)
+    , m_message(WTFMove(message))
+{
+    ASSERT(code);
+}
+
+inline Exception isolatedCopy(Exception&& value)
+{
+    return Exception { value.code(), value.releaseMessage().isolatedCopy() };
+}
+
+}