Split SystemAccess into TimezoneSettings, StatisticsProvider, and SyslogsProvider.

chrome/browser/chromeos/system/timezone_settings.h

+// Copyright (c) 2011 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_SYSTEM_TIMEZONE_SETTINGS_H_
+#define CHROME_BROWSER_CHROMEOS_SYSTEM_TIMEZONE_SETTINGS_H_
+#pragma once
+
+#include <string>
+
+#include "base/callback_old.h"
+#include "content/browser/cancelable_request.h"
+#include "unicode/timezone.h"
+
+namespace chromeos {
+namespace system {
+
+// This interface provides access to Chrome OS timezone settings.
+class TimezoneSettings : public CancelableRequestProvider {
+ public:
+  class Observer {
+   public:
+    // Called when the timezone has changed. |timezone| is non-null.
+    virtual void TimezoneChanged(const icu::TimeZone& timezone) = 0;
+  };
+
+  static TimezoneSettings* GetInstance();
+
+  // Returns the current timezone as an icu::Timezone object.
+  virtual const icu::TimeZone& GetTimezone() = 0;
+
+  // Sets the current timezone. |timezone| must be non-null.
+  virtual void SetTimezone(const icu::TimeZone& timezone) = 0;
+
+  virtual void AddObserver(Observer* observer) = 0;
+  virtual void RemoveObserver(Observer* observer) = 0;
+
+ protected:
+  virtual ~TimezoneSettings() {}
+};
+
+}  // namespace system
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_SYSTEM_TIMEZONE_SETTINGS_H_