Add device policies to control accessibility settings on the login screen

chrome/browser/chromeos/policy/recommendation_restorer.h

+// Copyright (c) 2013 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_POLICY_RECOMMENDATION_RESTORER_H_
+#define CHROME_BROWSER_CHROMEOS_POLICY_RECOMMENDATION_RESTORER_H_
+
+#include <map>
+#include <string>
+
+#include "ash/wm/user_activity_observer.h"
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/prefs/pref_change_registrar.h"
+#include "base/timer.h"
+#include "components/browser_context_keyed_service/browser_context_keyed_service.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+
+class PrefService;
+class Profile;
+
+namespace base {
+class Value;
+}
+
+namespace policy {
+
+// Clears user-set prefs in the login profile to restore recommended values. The
+// recommended values are restored when the login screen is first shown and
+// whenever the user becomes idle for one minute.
+class RecommendationRestorerInternal : public ash::UserActivityObserver {
+ public:
+  explicit RecommendationRestorerInternal(PrefService* prefs);
+  virtual ~RecommendationRestorerInternal();
+
+  // ash::UserActivityObserver::Observer:
+  virtual void OnUserActivity() OVERRIDE;
+
+  void CheckPref(const std::string& pref_name);

[Mattias Nissler (ping if slow), 2013/06/12 13:55:16]

needs doc

[bartfab (slow), 2013/06/12 18:57:49]

Done.

+
+ private:
+  void RestoreAll();
+
+  PrefChangeRegistrar registrar_;
+
+  std::map<std::string, base::Value*> recommended_values_;

[Mattias Nissler (ping if slow), 2013/06/12 13:55:16]

what is this good for?

[bartfab (slow), 2013/06/12 18:57:49]

Adeed a comment explaining the purpose.

+
+  base::OneShotTimer<RecommendationRestorerInternal> restore_timer_;
+
+  DISALLOW_COPY_AND_ASSIGN(RecommendationRestorerInternal);
+};
+
+// BCKS that is instantiated for all profiles. Ensures that a
+// RecommendationRestorerInternal exists only for the login profile and only
+// while the login screen is being shown.
+class RecommendationRestorer : public BrowserContextKeyedService,
+                               public content::NotificationObserver {
+ public:
+  explicit RecommendationRestorer(Profile* profile);
+  virtual ~RecommendationRestorer();
+
+  // BrowserContextKeyedService:
+  virtual void Shutdown() OVERRIDE;
+
+  // content::NotificationObserver:
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+ private:
+  friend class RecommendationRestorerTest;
+
+  scoped_ptr<RecommendationRestorerInternal> recommendation_restorer_internal_;
+
+  content::NotificationRegistrar registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(RecommendationRestorer);
+};
+
+}  // namespace policy
+
+#endif  // CHROME_BROWSER_CHROMEOS_POLICY_RECOMMENDATION_RESTORER_H_