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

third_party/WebKit/Source/bindings/core/v8/ExceptionState.h

Index: third_party/WebKit/Source/bindings/core/v8/ExceptionState.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/ExceptionState.h b/third_party/WebKit/Source/bindings/core/v8/ExceptionState.h
index c28703fe5982dcc69652cfab70a5941e2f652e87..18d94aaf2a9bbbb72ad9bfdf3c8b8791c5f28bac 100644
--- a/third_party/WebKit/Source/bindings/core/v8/ExceptionState.h
+++ b/third_party/WebKit/Source/bindings/core/v8/ExceptionState.h
@@ -130,6 +130,8 @@ public:
     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.
@@ -138,8 +140,6 @@ protected:
     void setException(ExceptionCode, const String&, v8::Local<v8::Value>);
 
 private:
-    String addExceptionContext(const String&) const;
-
     ExceptionCode m_code;
     ContextType m_context;
     String m_message;