Domain Reliability: Add more upload-related histograms.

components/domain_reliability/context.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_CONTEXT_H_
 #define COMPONENTS_DOMAIN_RELIABILITY_CONTEXT_H_
 
 #include <stddef.h>
 
 #include <deque>
@@ skipping 43 matching lines @@
       const std::string& upload_reporter_string,
       const base::TimeTicks* last_network_change_time,
       DomainReliabilityDispatcher* dispatcher,
       DomainReliabilityUploader* uploader,
       std::unique_ptr<const DomainReliabilityConfig> config);
   ~DomainReliabilityContext();
 
   // Notifies the context of a beacon on its domain(s); may or may not save the
   // actual beacon to be uploaded, depending on the sample rates in the config,
   // but will increment one of the request counters in any case.
-  void OnBeacon(std::unique_ptr<DomainReliabilityBeacon> beacon);
+  //
+  // Returns |true| if the beacon was queued or |false| if it was discarded,
+  // for metrics purposes.
+  bool OnBeacon(std::unique_ptr<DomainReliabilityBeacon> beacon);
 
   // Called to clear browsing data, since beacons are like browsing history.
   void ClearBeacons();
 
   // Gets a Value containing data that can be formatted into a web page for
   // debugging purposes.
   std::unique_ptr<base::Value> GetWebUIData() const;
 
   // Gets the beacons queued for upload in this context. |*beacons_out| will be
   // cleared and filled with pointers to the beacons; the pointers remain valid
@@ skipping 40 matching lines @@
   DomainReliabilityUploader* uploader_;
 
   std::deque<std::unique_ptr<DomainReliabilityBeacon>> beacons_;
   size_t uploading_beacons_size_;
   base::TimeTicks upload_time_;
   base::TimeTicks last_upload_time_;
   // The last network change time is not tracked per-context, so this is a
   // pointer to that value in a wider (e.g. per-Monitor or unittest) scope.
   const base::TimeTicks* last_network_change_time_;
 
+  base::TimeTicks last_queued_beacon_time_;
+
   base::WeakPtrFactory<DomainReliabilityContext> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DomainReliabilityContext);
 };
 
 }  // namespace domain_reliability
 
 #endif  // COMPONENTS_DOMAIN_RELIABILITY_CONTEXT_H_