Revert of Revert of Domain Reliability: Switch to BackoffEntry in Scheduler

components/domain_reliability/scheduler.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 COMPONENTS_DOMAIN_RELIABILITY_SCHEDULER_H_
 #define COMPONENTS_DOMAIN_RELIABILITY_SCHEDULER_H_
 
 #include <vector>
 
 #include "base/callback.h"
+#include "base/memory/scoped_vector.h"
 #include "base/time/time.h"
 #include "components/domain_reliability/domain_reliability_export.h"
+#include "net/base/backoff_entry.h"
 
 namespace base {
 class Value;
 }  // namespace base
 
 namespace domain_reliability {
 
 class DomainReliabilityConfig;
 class MockableTime;
 
@@ skipping 41 matching lines @@
   // future retries, if the upload ends up failing.)
   size_t OnUploadStart();
 
   // Updates the scheduler state based on the result of an upload. Must be
   // called exactly once after |OnUploadStart|. |success| should be true if the
   // upload was successful, and false otherwise.
   void OnUploadComplete(bool success);
 
   base::Value* GetWebUIData() const;
 
+  // Disables jitter in BackoffEntries to make scheduling deterministic for
+  // unit tests.
+  void MakeDeterministicForTesting();
+
  private:
-  struct CollectorState {
-    CollectorState();
-
-    // The number of consecutive failures to upload to this collector, or 0 if
-    // the most recent upload succeeded.
-    unsigned failures;
-    base::TimeTicks next_upload;
-  };
-
   void MaybeScheduleUpload();
 
   void GetNextUploadTimeAndCollector(base::TimeTicks now,
                                      base::TimeTicks* upload_time_out,
                                      size_t* collector_index_out);
 
-  base::TimeDelta GetUploadRetryInterval(unsigned failures);
-
   MockableTime* time_;
-  std::vector<CollectorState> collectors_;
   Params params_;
   ScheduleUploadCallback callback_;
+  net::BackoffEntry::Policy backoff_policy_;
+  ScopedVector<net::BackoffEntry> collectors_;
 
   // Whether there are beacons that have not yet been uploaded. Set when a
   // beacon arrives or an upload fails, and cleared when an upload starts.
   bool upload_pending_;
 
   // Whether the scheduler has called the ScheduleUploadCallback to schedule
   // the next upload. Set when an upload is scheduled and cleared when the
   // upload starts.
   bool upload_scheduled_;
 
@@ skipping 19 matching lines @@
   bool last_upload_finished_;
   base::TimeTicks last_upload_start_time_;
   base::TimeTicks last_upload_end_time_;
   size_t last_upload_collector_index_;
   bool last_upload_success_;
 };
 
 }  // namespace domain_reliability
 
 #endif  // COMPONENTS_DOMAIN_RELIABILITY_SCHEDULER_H_