diff --git a/Source/bindings/v8/ExceptionState.h b/Source/bindings/v8/ExceptionState.h
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+++ b/Source/bindings/v8/ExceptionState.h
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+/*
+ * Copyright (C) 2013 Google 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER OR 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.
+ */
+
+#ifndef ExceptionState_h
+#define ExceptionState_h
+
+#include "bindings/v8/ScopedPersistent.h"
+#include "bindings/v8/V8ThrowException.h"
+#include "wtf/Noncopyable.h"
+#include <v8.h>
+
+namespace WebCore {
+
+typedef int ExceptionCode;
+
+class ExceptionState {
+    WTF_MAKE_NONCOPYABLE(ExceptionState);
+public:
+    explicit ExceptionState(v8::Isolate* isolate)
+        : m_code(0)
+        , m_isolate(isolate) { }
+
+    virtual void throwDOMException(const ExceptionCode&,  const char* message = 0);
+    virtual void throwTypeError(const char* message = 0);
+
+    bool hadException() const { return !m_exception.isEmpty() || m_code; }
+    void clearException();
+
+    bool throwIfNeeded()
+    {
+        if (m_exception.isEmpty()) {
+            if (!m_code)
+                return false;
+            throwDOMException(m_code);
+        }
+
+        V8ThrowException::throwError(m_exception.get());
+        return true;
+    }
+
+    // FIXME: Remove the rest of the public methods/operators once the transition is done.
+    typedef void* ExceptionState::*UnspecifiedBoolType;
+    operator UnspecifiedBoolType*() const
+    {
+        return m_code ? reinterpret_cast<UnspecifiedBoolType*>(1) : 0;
+    }
+
+    operator ExceptionCode& () { return m_code; }
+
+    ExceptionState& operator=(const ExceptionCode& ec)
+    {
+        throwDOMException(ec);
+        return *this;
+    }
+
+protected:
+    ExceptionCode m_code;
+
+private:
+    void setException(v8::Handle<v8::Value>);
+
+    ScopedPersistent<v8::Value> m_exception;
+    v8::Isolate* m_isolate;
+};
+
+class NonThrowExceptionState : public ExceptionState {
+public:
+    NonThrowExceptionState();
+    virtual void throwDOMException(const ExceptionCode&, const char* = 0) OVERRIDE FINAL;
+    virtual void throwTypeError(const char* = 0) OVERRIDE FINAL;
+};
+
+} // namespace WebCore
+
+#endif // ExceptionState_h