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

components/domain_reliability/scheduler.h

Index: components/domain_reliability/scheduler.h
diff --git a/components/domain_reliability/scheduler.h b/components/domain_reliability/scheduler.h
index 95b2fbfa8f926343f482187b3969e4a050dabc00..5d387c9db58d4d0a2f729c7eefde4bdbd12c36d6 100644
--- a/components/domain_reliability/scheduler.h
+++ b/components/domain_reliability/scheduler.h
@@ -8,8 +8,10 @@
 #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;
@@ -71,28 +73,22 @@
 
   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.