Http cache: Measure back navigations on the infinite cache simulation.

net/http/infinite_cache.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 is the interface of a simulated infinite cache. The purpose of this
 // code is to evaluate the performance of an HTTP cache that is not constrained
 // to evict resources.
 
 #ifndef NET_HTTP_INFINITE_CACHE_H_
 #define NET_HTTP_INFINITE_CACHE_H_
@@ skipping 25 matching lines @@
 // every request that goes through the HttpCache. This object is notified when
 // relevant steps are reached while processing the request.
 class NET_EXPORT_PRIVATE InfiniteCacheTransaction {
  public:
   explicit InfiniteCacheTransaction(InfiniteCache* cache);
   ~InfiniteCacheTransaction();
 
   // Called when a new HttpTransaction is started.
   void OnRequestStart(const HttpRequestInfo* request);
 
+  // Called when the transaction corresponds to a back navigation.
+  void OnBackForwardNavigation();
+
   // Called when the response headers are available.
   void OnResponseReceived(const HttpResponseInfo* response);
 
   // Called when the response data is received from the network.
   void OnDataRead(const char* data, int data_len);
 
   // Called when the resource is marked as truncated by the HttpCache.
   void OnTruncatedResponse();
 
   // Called when the resource is served from the cache, so OnDataRead will not
@@ skipping 54 matching lines @@
   scoped_refptr<base::SequencedWorkerPool> worker_pool_;
   scoped_refptr<base::SequencedTaskRunner> task_runner_;
   base::RepeatingTimer<InfiniteCache> timer_;
 
   DISALLOW_COPY_AND_ASSIGN(InfiniteCache);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_INFINITE_CACHE_H_