Structured cloning: improve DataCloneError reporting.

Source/bindings/v8/ExceptionState.h

 /*
  * 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
@@ skipping 88 matching lines @@
         }
 
         V8ThrowException::throwError(m_exception.newLocal(m_isolate), m_isolate);
         return true;
     }
 
     Context context() const { return m_context; }
     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;
     const char* m_propertyName;
     const char* m_interfaceName;
 
 private:
     void setException(v8::Handle<v8::Value>);
 
     String addExceptionContext(const String&) const;
 
     ScopedPersistent<v8::Value> m_exception;
     v8::Handle<v8::Object> m_creationContext;
     v8::Isolate* m_isolate;
 };
 
 class TrackExceptionState : public ExceptionState {
 public:
     TrackExceptionState(): ExceptionState(v8::Handle<v8::Object>(), 0) { }
     virtual void throwDOMException(const ExceptionCode&, const String& message) OVERRIDE FINAL;
     virtual void throwTypeError(const String& message = String()) OVERRIDE FINAL;
     virtual void throwSecurityError(const String& sanitizedMessage, const String& unsanitizedMessage = String()) OVERRIDE FINAL;
 };
 
 } // namespace WebCore
 
 #endif // ExceptionState_h