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diff --git a/base/json/json_writer.h b/base/json/json_writer.h
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+++ b/base/json/json_writer.h
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+// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_JSON_JSON_WRITER_H_
+#define BASE_JSON_JSON_WRITER_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+
+class Value;
+
+namespace base {
+
+class JSONWriter {
+ public:
+  // Given a root node, generates a JSON string and puts it into |json|.
+  // If |pretty_print| is true, return a slightly nicer formated json string
+  // (pads with whitespace to help readability).  If |pretty_print| is false,
+  // we try to generate as compact a string as possible.
+  // TODO(tc): Should we generate json if it would be invalid json (e.g.,
+  // |node| is not a DictionaryValue/ListValue or if there are inf/-inf float
+  // values)?
+  static void Write(const Value* const node, bool pretty_print,
+                    std::string* json);
+
+  // Same as above, but has an option to not escape the string, preserving its
+  // UTF8 characters. It is useful if you can pass resulting string to the
+  // JSON parser in binary form (as UTF8).
+  static void WriteWithOptionalEscape(const Value* const node,
+                                      bool pretty_print,
+                                      bool escape,
+                                      std::string* json);
+
+ private:
+  JSONWriter(bool pretty_print, std::string* json);
+
+  // Called recursively to build the JSON string.  Whe completed, value is
+  // json_string_ will contain the JSON.
+  void BuildJSONString(const Value* const node, int depth, bool escape);
+
+  // Appends a quoted, escaped, version of str to json_string_.
+  void AppendQuotedString(const std::wstring& str);
+
+  // Adds space to json_string_ for the indent level.
+  void IndentLine(int depth);
+
+  // Where we write JSON data as we generate it.
+  std::string* json_string_;
+
+  bool pretty_print_;
+
+  DISALLOW_COPY_AND_ASSIGN(JSONWriter);
+};
+
+}  // namespace base
+
+#endif  // BASE_JSON_JSON_WRITER_H_