Implement v8::ValueSerializer::Delegate to throw DOMException for DataCloneError.

third_party/WebKit/Source/bindings/core/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 112 matching lines @@
 
     // This method clears out the exception which |this| has.
     ScriptPromise reject(ScriptState*);
 
     // This method clears out the exception which |this| has.
     void reject(ScriptPromiseResolver*);
 
     const char* propertyName() const { return m_propertyName; }
     const char* interfaceName() const { return m_interfaceName; }
 
+    String addExceptionContext(const String&) const;
+
 protected:
     // An ExceptionCode for the case that an exception is rethrown.  In that
     // case, we cannot determine an exception code.
     static const int kRethrownException = UnknownError;
 
     void setException(ExceptionCode, const String&, v8::Local<v8::Value>);
 
 private:
-    String addExceptionContext(const String&) const;
-
     ExceptionCode m_code;
     ContextType m_context;
     String m_message;
     const char* m_propertyName;
     const char* m_interfaceName;
     // The exception is empty when it was thrown through TrackExceptionState.
     ScopedPersistent<v8::Value> m_exception;
     v8::Isolate* m_isolate;
 };
 
@@ skipping 29 matching lines @@
     void throwDOMException(const ExceptionCode&, const String& message) override;
     void throwTypeError(const String& message) override;
     void throwSecurityError(const String& sanitizedMessage, const String& unsanitizedMessage) override;
     void throwRangeError(const String& message) override;
     void rethrowV8Exception(v8::Local<v8::Value>) override;
 };
 
 } // namespace blink
 
 #endif // ExceptionState_h