Escape all of invalid values in console messages for INPUT elements.

Source/platform/JSONValues.h

 /*
  * Copyright (C) 2009 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 99 matching lines @@
     virtual bool asObject(RefPtr<JSONObject>* output);
     virtual bool asArray(RefPtr<JSONArray>* output);
     virtual PassRefPtr<JSONObject> asObject();
     virtual PassRefPtr<JSONArray> asArray();
 
     String toJSONString() const;
     String toPrettyJSONString() const;
     virtual void writeJSON(StringBuilder* output) const;
     virtual void prettyWriteJSON(StringBuilder* output) const;
 
+    static String quoteString(const String&);
+
 protected:
     explicit JSONValue(Type type) : m_type(type) { }
     virtual void prettyWriteJSONInternal(StringBuilder* output, int depth) const;
 
 private:
     friend class JSONObjectBase;
     friend class JSONArrayBase;
 
     Type m_type;
 };
@@ skipping 210 matching lines @@
 
     using JSONArrayBase::get;
 
     using JSONArrayBase::begin;
     using JSONArrayBase::end;
 };
 
 } // namespace blink
 
 #endif // JSONValues_h