Structured cloning: improve DataCloneError reporting.

Source/bindings/v8/ExceptionState.h

Index: Source/bindings/v8/ExceptionState.h
diff --git a/Source/bindings/v8/ExceptionState.h b/Source/bindings/v8/ExceptionState.h
index bfe2790e16a84ac1aa19d47d039b94074bdf9fe8..69fea70bdc9ccf6852185ca9b839f2cb4fd5f00f 100644
--- a/Source/bindings/v8/ExceptionState.h
+++ b/Source/bindings/v8/ExceptionState.h
@@ -106,6 +106,11 @@ public:
     const char* propertyName() const { return m_propertyName; }
     const char* interfaceName() const { return m_interfaceName; }
 
+    void rethrowV8Exception(v8::Handle<v8::Value> value)
+    {
+        setException(value);
+    }
+
 protected:
     ExceptionCode m_code;
     Context m_context;