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diff --git a/chrome/browser/chromeos/cros_settings.h b/chrome/browser/chromeos/cros_settings.h
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+++ b/chrome/browser/chromeos/cros_settings.h
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+// Copyright (c) 2010 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 CHROME_BROWSER_CHROMEOS_CROS_SETTINGS_H_
+#define CHROME_BROWSER_CHROMEOS_CROS_SETTINGS_H_
+
+#include <string>
+#include "base/values.h"
+
+#include "chrome/browser/chromeos/cros_settings_names.h"
+
+namespace chromeos {
+
+// A class manages per-device/global settings.
+class CrosSettings {
+ public:
+  // Class factory.
+  static CrosSettings* Get();
+
+  // Helper function to test if given path is a value cros settings name.
+  static bool IsCrosSettings(const std::wstring& path);
+
+  // Sets |in_value| to given |path| in cros settings.
+  // Note that this takes ownership of |in_value|.
+  virtual void Set(const std::wstring& path, Value* in_value) = 0;
+
+  // Gets settings value of given |path| to |out_value|.
+  // Note that |out_value| is still owned by this class.
+  virtual bool Get(const std::wstring& path, Value** out_value) const = 0;
+
+  // Convenience forms of Set().  These methods will replace any existing
+  // value at that path, even if it has a different type.
+  void SetBoolean(const std::wstring& path, bool in_value);
+  void SetInteger(const std::wstring& path, int in_value);
+  void SetReal(const std::wstring& path, double in_value);
+  void SetString(const std::wstring& path, const std::string& in_value);
+
+  // These are convenience forms of Get().  The value will be retrieved
+  // and the return value will be true if the path is valid and the value at
+  // the end of the path can be returned in the form specified.
+  bool GetBoolean(const std::wstring& path, bool* out_value) const;
+  bool GetInteger(const std::wstring& path, int* out_value) const;
+  bool GetReal(const std::wstring& path, double* out_value) const;
+  bool GetString(const std::wstring& path, std::string* out_value) const;
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_CROS_SETTINGS_H_