Split HttpCache miss tracking by Open and Create

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 403 matching lines @@
   UploadProgress final_upload_progress_;
   base::WeakPtrFactory<Transaction> weak_factory_;
   CompletionCallback io_callback_;
 
   // Members used to track data for histograms.
   TransactionPattern transaction_pattern_;
   int bytes_read_from_cache_;
   int bytes_read_from_network_;
   base::TimeTicks entry_lock_waiting_since_;
   base::TimeTicks first_cache_access_since_;
+  base::TimeTicks miss_since_;
   base::TimeTicks send_request_since_;
 
   // For sensitivity analysis (field trials emulating longer cache IO times),
   // the time at which a cache IO action has started, or base::TimeTicks()
   // if no cache IO action is currently in progress.
   base::TimeTicks cache_io_start_;
 
   // For OpenEntry and CreateEntry, if sensitivity analysis would mandate
   // a delay on return, we must defer that delay until AddToEntry has been
   // called, to avoid a race condition on the address returned.
   base::TimeDelta deferred_cache_sensitivity_delay_;
   bool defer_cache_sensitivity_delay_;
 
   // For sensitivity analysis, the simulated increase in cache service times,
   // in percent.
   int sensitivity_analysis_percent_increase_;
 
   HttpTransactionDelegate* transaction_delegate_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_CACHE_TRANSACTION_H_