Add avatar syncing for supervised users.

chrome/browser/managed_mode/supervised_user_pref_mapping_service.h

+// Copyright 2014 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_MANAGED_MODE_SUPERVISED_USER_PREF_MAPPING_SERVICE_H_
+#define CHROME_BROWSER_MANAGED_MODE_SUPERVISED_USER_PREF_MAPPING_SERVICE_H_
+
+#include "base/callback.h"
+#include "base/callback_list.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/prefs/pref_change_registrar.h"
+#include "chrome/browser/managed_mode/managed_users.h"
+#include "components/browser_context_keyed_service/browser_context_keyed_service.h"
+
+class ManagedUserSharedSettingsService;
+class PrefService;
+
+// SupervisedUserPrefMappingService maps shared managed user settings to user
+// preferences. When a shared managed user setting is updated via sync, the
+// corresponding local user preference is set to this new value.
+class SupervisedUserPrefMappingService : public BrowserContextKeyedService {
+ public:
+  typedef base::CallbackList<void(const std::string&, const std::string&)>
+      CallbackList;
+
+  SupervisedUserPrefMappingService(
+      PrefService* prefs,
+      ManagedUserSharedSettingsService* shared_settings);
+  virtual ~SupervisedUserPrefMappingService();
+
+  // BrowserContextKeyedService implementation:
+  virtual void Shutdown() OVERRIDE;
+
+  void Init();
+
+  // Updates the managed user shared setting when the avatar has changed.
+  void OnAvatarChanged();
+
+  // Called when a managed user shared setting was changed by receiving new sync
+  // data. Updates the corresponding user pref.
+  void OnSharedSettingChanged(const std::string& mu_id, const std::string& key);
+
+ private:
+  // Returns the current chrome avatar index that is stored as a managed user
+  // shared setting, or -1 if no avatar index is stored.
+  int GetChromeAvatarIndex();
+
+  PrefService* prefs_;
+  ManagedUserSharedSettingsService* shared_settings_;
+  scoped_ptr<CallbackList::Subscription> subscription_;
+  std::string managed_user_id_;
+  PrefChangeRegistrar pref_change_registrar_;
+  base::WeakPtrFactory<SupervisedUserPrefMappingService> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(SupervisedUserPrefMappingService);
+};
+
+#endif  // CHROME_BROWSER_MANAGED_MODE_SUPERVISED_USER_PREF_MAPPING_SERVICE_H_