Record the number of freshness periods since a stale HttpCache entry was last used

net/http/http_cache_transaction.h

 // Copyright (c) 2012 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.
 
 // This file declares HttpCache::Transaction, a private class of HttpCache so
 // it should only be included by http_cache.cc
 
 #ifndef NET_HTTP_HTTP_CACHE_TRANSACTION_H_
 #define NET_HTTP_HTTP_CACHE_TRANSACTION_H_
 
@@ skipping 466 matching lines @@
   std::unique_ptr<PartialData> partial_;  // We are dealing with range requests.
   UploadProgress final_upload_progress_;
   CompletionCallback io_callback_;
 
   // Members used to track data for histograms.
   TransactionPattern transaction_pattern_;
   ValidationCause validation_cause_;
   base::TimeTicks entry_lock_waiting_since_;
   base::TimeTicks first_cache_access_since_;
   base::TimeTicks send_request_since_;
+  base::Time open_entry_last_used_;
+  base::TimeDelta stale_entry_freshness_;
 
   int64_t total_received_bytes_;
   int64_t total_sent_bytes_;
 
   // Load timing information for the last network request, if any.  Set in the
   // 304 and 206 response cases, as the network transaction may be destroyed
   // before the caller requests load timing information.
   std::unique_ptr<LoadTimingInfo> old_network_trans_load_timing_;
 
   ConnectionAttempts old_connection_attempts_;
@@ skipping 10 matching lines @@
   BeforeProxyHeadersSentCallback before_proxy_headers_sent_callback_;
 
   base::WeakPtrFactory<Transaction> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Transaction);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_CACHE_TRANSACTION_H_