Add BackupRollbackController for starting backup/rollback

chrome/browser/sync/backup_rollback_controller.h

+// Copyright (c) 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_SYNC_BACKUP_ROLLBACK_CONTROLLER_H_
+#define CHROME_BROWSER_SYNC_BACKUP_ROLLBACK_CONTROLLER_H_
+
+#include "base/callback.h"
+#include "base/memory/weak_ptr.h"
+
+class ManagedUserSigninManagerWrapper;
+
+namespace sync_driver {
+class SyncPrefs;
+}
+
+namespace browser_sync {
+
+// BackupRollbackController takes two closures for starting backup/rollback
+// process. It calls the closures according to user's signin status or
+// received rollback command.
+class BackupRollbackController {
+ public:
+  BackupRollbackController(sync_driver::SyncPrefs* sync_prefs,
+                           const ManagedUserSigninManagerWrapper* signin,
+                           base::Closure start_backup,
+                           base::Closure start_rollback);
+  ~BackupRollbackController();
+
+  // Check to see whether to start backup/rollback. |delay| specifies the time
+  // to wait before checking.
+  void Start(base::TimeDelta delay);
+
+  // Update rollback preference to indicate rollback is needed.
+  void OnRollbackReceived();
+
+  // Update rollback preference to indicate rollback is finished.
+  void OnRollbackDone();
+
+ private:
+  // Check signin status and rollback preference and start backup/rollback
+  // accordingly.
+  void TryStart();
+
+  sync_driver::SyncPrefs* sync_prefs_;
+
+  // Use ManagedUserSigninManagerWrapper instead of SigninManagerBase because
+  // SigninManagerBase could return non-empty user name for managed user, which
+  // would cause backup to trumpet normal sync for managed user.
+  const ManagedUserSigninManagerWrapper* signin_;
+
+  base::Closure start_backup_;
+  base::Closure start_rollback_;
+  base::WeakPtrFactory<BackupRollbackController> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(BackupRollbackController);
+};
+
+}  // namespace browser_sync
+
+#endif  // CHROME_BROWSER_SYNC_BACKUP_ROLLBACK_CONTROLLER_H_