Move Chrome OS device settings stuff to chrome/browser/chromeos/settings.

chrome/browser/chromeos/cros_settings_provider.h

-// 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 CHROME_BROWSER_CHROMEOS_CROS_SETTINGS_PROVIDER_H_
-#define CHROME_BROWSER_CHROMEOS_CROS_SETTINGS_PROVIDER_H_
-
-#include <string>
-
-#include "base/callback.h"
-
-namespace base {
-class Value;
-}
-
-namespace chromeos {
-
-class CrosSettingsProvider {
- public:
-  // The callback type that is called to notify the CrosSettings observers
-  // about a setting change.
-  typedef base::Callback<void(const std::string&)> NotifyObserversCallback;
-
-  // Possible results of a trusted check.
-  enum TrustedStatus {
-    // The trusted values were populated in the cache and can be accessed
-    // until the next iteration of the message loop.
-    TRUSTED,
-    // Either a store or a load operation is in progress. The provided
-    // callback will be invoked once the verification has finished.
-    TEMPORARILY_UNTRUSTED,
-    // The verification of the trusted store has failed permanently. The
-    // client should assume this state final and further checks for
-    // trustedness will fail at least until the browser restarts.
-    PERMANENTLY_UNTRUSTED,
-  };
-
-  // Creates a new provider instance. |notify_cb| will be used to notify
-  // about setting changes.
-  explicit CrosSettingsProvider(const NotifyObserversCallback& notify_cb);
-  virtual ~CrosSettingsProvider();
-
-  // Sets |in_value| to given |path| in cros settings.
-  void Set(const std::string& path, const base::Value& in_value);
-
-  // Gets settings value of given |path| to |out_value|.
-  virtual const base::Value* Get(const std::string& path) const = 0;
-
-  // Requests the provider to fetch its values from a trusted store, if it
-  // hasn't done so yet. Returns TRUSTED if the values returned by this provider
-  // are trusted during the current loop cycle. Otherwise returns
-  // TEMPORARILY_UNTRUSTED, and |callback| will be invoked later when trusted
-  // values become available, PrepareTrustedValues() should be tried again in
-  // that case. Returns PERMANENTLY_UNTRUSTED if a permanent error has occurred.
-  virtual TrustedStatus PrepareTrustedValues(
-      const base::Closure& callback) = 0;
-
-  // Gets the namespace prefix provided by this provider.
-  virtual bool HandlesSetting(const std::string& path) const = 0;
-
-  // Reloads the caches if the provider has any.
-  virtual void Reload() = 0;
-
-  void SetNotifyObserversCallback(const NotifyObserversCallback& notify_cb);
-
- protected:
-  // Notifies the observers about a setting change.
-  void NotifyObservers(const std::string& path);
-
- private:
-  // Does the real job for Set().
-  virtual void DoSet(const std::string& path,
-                     const base::Value& in_value) = 0;
-
-  // Callback used to notify about setting changes.
-  NotifyObserversCallback notify_cb_;
-};
-
-}  // namespace chromeos
-
-#endif  // CHROME_BROWSER_CHROMEOS_CROS_SETTINGS_PROVIDER_H_