Domain Reliability: Measure backoff/retry time to collectors.

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"
@@ skipping 60 matching lines @@
   // called exactly once after |OnUploadStart|. |result| should be the result
   // passed to the upload callback by the Uploader.
   void OnUploadComplete(const DomainReliabilityUploader::UploadResult& result);
 
   base::Value* GetWebUIData() const;
 
   // Disables jitter in BackoffEntries to make scheduling deterministic for
   // unit tests.
   void MakeDeterministicForTesting();
 
+  // Gets the time until the next upload attempt on the last collector used.
+  // This will be 0 if the upload was a success; it does not take into account
+  // minimum_upload_delay and maximum_upload_delay.
+  base::TimeDelta last_collector_retry_delay() const {
+    return last_collector_retry_delay_;
+  }
+
  private:
   void MaybeScheduleUpload();
 
   void GetNextUploadTimeAndCollector(base::TimeTicks now,
                                      base::TimeTicks* upload_time_out,
                                      size_t* collector_index_out);
 
   MockableTime* time_;
   Params params_;
   ScheduleUploadCallback callback_;
@@ skipping 17 matching lines @@
   // |OnUploadStart| and cleared in |OnUploadComplete|.)
   size_t collector_index_;
 
   // Time of the first beacon that was not included in the last successful
   // upload.
   base::TimeTicks first_beacon_time_;
 
   // first_beacon_time_ saved during uploads.  Restored if upload fails.
   base::TimeTicks old_first_beacon_time_;
 
+  // Time until the next upload attempt on the last collector used. (Saved for
+  // histograms in Context.)
+  base::TimeDelta last_collector_retry_delay_;
+
   // Extra bits to return in GetWebUIData.
   base::TimeTicks scheduled_min_time_;
   base::TimeTicks scheduled_max_time_;
   // Whether the other last_upload_* fields are populated.
   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_