Revert of Add SyncScheduler for scheduling CryptAuth enrollments and syncing devices.

components/proximity_auth/cryptauth/sync_scheduler_impl.h

-// Copyright 2015 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 COMPONENTS_PROXIMITY_AUTH_CRYPTAUTH_CRYPTAUTH_SYNC_SCHEDULER_IMPL_H
-#define COMPONENTS_PROXIMITY_AUTH_CRYPTAUTH_CRYPTAUTH_SYNC_SCHEDULER_IMPL_H
-
-#include "base/timer/timer.h"
-#include "components/proximity_auth/cryptauth/sync_scheduler.h"
-
-namespace proximity_auth {
-
-// Implementation of SyncScheduler.
-class SyncSchedulerImpl : public SyncScheduler {
- public:
-  // Creates the scheduler:
-  // |delegate|: Handles sync requests and must outlive the scheduler.
-  // |refresh_period|: The time to wait for the PERIODIC_REFRESH strategy.
-  // |base_recovery_period|: The initial time to wait for the
-  //    AGGRESSIVE_RECOVERY strategy. The time delta is increased for each
-  //    subsequent failure.
-  // |max_jitter_ratio|: The maximum ratio that the time to next sync can be
-  //    jittered (both positively and negatively).
-  // |scheduler_name|: The name of the scheduler for debugging purposes.
-  SyncSchedulerImpl(Delegate* delegate,
-                    base::TimeDelta refresh_period,
-                    base::TimeDelta base_recovery_period,
-                    double max_jitter_ratio,
-                    const std::string& scheduler_name);
-
-  ~SyncSchedulerImpl() override;
-
-  // SyncScheduler:
-  void Start(const base::TimeDelta& elapsed_time_since_last_sync,
-             Strategy strategy) override;
-  void ForceSync() override;
-  base::TimeDelta GetTimeToNextSync() const override;
-  Strategy GetStrategy() const override;
-  SyncState GetSyncState() const override;
-
- protected:
-  // Creates and returns a base::Timer object. Exposed for testing.
-  virtual scoped_ptr<base::Timer> CreateTimer();
-
- private:
-  // SyncScheduler:
-  void OnSyncCompleted(bool success) override;
-
-  // Called when |timer_| is fired.
-  void OnTimerFired();
-
-  // Schedules |timer_| for the next sync request.
-  void ScheduleNextSync(const base::TimeDelta& sync_delta);
-
-  // Adds a random jitter to the value of GetPeriod(). The returned
-  // TimeDelta will be clamped to be non-negative.
-  base::TimeDelta GetJitteredPeriod();
-
-  // Returns the time to wait for the current strategy.
-  base::TimeDelta GetPeriod();
-
-  // The delegate handling sync requests when they are fired.
-  Delegate* const delegate_;
-
-  // The time to wait until the next refresh when the last sync attempt was
-  // successful.
-  const base::TimeDelta refresh_period_;
-
-  // The base recovery period for the AGGRESSIVE_RECOVERY strategy before
-  // backoffs are applied.
-  const base::TimeDelta base_recovery_period_;
-
-  // The maximum percentage (both positively and negatively) that the time to
-  // wait between each sync request is jittered. The jitter is randomly applied
-  // to each period so we can avoid synchronous calls to the server.
-  const double max_jitter_ratio_;
-
-  // The name of the scheduler, used for debugging purposes.
-  const std::string scheduler_name_;
-
-  // The current strategy of the scheduler.
-  Strategy strategy_;
-
-  // The current state of the scheduler.
-  SyncState sync_state_;
-
-  // The number of failed syncs made in a row. Once a sync request succeeds,
-  // this counter is reset.
-  size_t failure_count_;
-
-  // Timer firing for the next sync request.
-  scoped_ptr<base::Timer> timer_;
-
-  base::WeakPtrFactory<SyncSchedulerImpl> weak_ptr_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(SyncSchedulerImpl);
-};
-
-}  // namespace proximity_auth
-
-#endif  // COMPONENTS_PROXIMITY_CRYPTAUTH_CRYPTAUTH_SYNC_SCHEDULER_IMPL_H