Break two classes defined in json_value_serializer.cc, .h into separate files.

base/json/json_string_value_serializer.h

Index: base/json/json_string_value_serializer.h
===================================================================
--- base/json/json_string_value_serializer.h	(revision 0)
+++ base/json/json_string_value_serializer.h	(revision 0)
@@ -0,0 +1,78 @@
+// Copyright (c) 2012 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_STRING_VALUE_SERIALIZER_H_
+#define BASE_JSON_JSON_STRING_VALUE_SERIALIZER_H_
+#pragma once
+
+#include <string>
+
+#include "base/base_export.h"
+#include "base/basictypes.h"
+#include "base/file_path.h"
+#include "base/values.h"
+
+class BASE_EXPORT JSONStringValueSerializer : public base::ValueSerializer {
+ public:
+  // json_string is the string that will be source of the deserialization
+  // or the destination of the serialization.  The caller of the constructor
+  // retains ownership of the string.
+  explicit JSONStringValueSerializer(std::string* json_string)
+      : json_string_(json_string),
+        initialized_with_const_string_(false),
+        pretty_print_(false),
+        allow_trailing_comma_(false) {
+  }
+
+  // This version allows initialization with a const string reference for
+  // deserialization only.
+  explicit JSONStringValueSerializer(const std::string& json_string)
+      : json_string_(&const_cast<std::string&>(json_string)),
+        initialized_with_const_string_(true),
+        pretty_print_(false),
+        allow_trailing_comma_(false) {
+  }
+
+  virtual ~JSONStringValueSerializer();
+
+  // Attempt to serialize the data structure represented by Value into
+  // JSON.  If the return value is true, the result will have been written
+  // into the string passed into the constructor.
+  virtual bool Serialize(const Value& root) OVERRIDE;
+
+  // Equivalent to Serialize(root) except binary values are omitted from the
+  // output.
+  bool SerializeAndOmitBinaryValues(const Value& root);
+
+  // Attempt to deserialize the data structure encoded in the string passed
+  // in to the constructor into a structure of Value objects.  If the return
+  // value is NULL, and if |error_code| is non-null, |error_code| will
+  // contain an integer error code (either JsonFileError or JsonParseError).
+  // If |error_message| is non-null, it will be filled in with a formatted
+  // error message including the location of the error if appropriate.
+  // The caller takes ownership of the returned value.
+  virtual Value* Deserialize(int* error_code,
+                             std::string* error_message) OVERRIDE;
+
+  void set_pretty_print(bool new_value) { pretty_print_ = new_value; }
+  bool pretty_print() { return pretty_print_; }
+
+  void set_allow_trailing_comma(bool new_value) {
+    allow_trailing_comma_ = new_value;
+  }
+
+ private:
+  bool SerializeInternal(const Value& root, bool omit_binary_values);
+
+  std::string* json_string_;
+  bool initialized_with_const_string_;
+  bool pretty_print_;  // If true, serialization will span multiple lines.
+  // If true, deserialization will allow trailing commas.
+  bool allow_trailing_comma_;
+
+  DISALLOW_COPY_AND_ASSIGN(JSONStringValueSerializer);
+};
+
+#endif  // BASE_JSON_JSON_STRING_VALUE_SERIALIZER_H_
+