Let prefetched resources skip cache revalidation once for a short duration.

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 163 matching lines @@
     STATE_UPDATE_CACHED_RESPONSE,
     STATE_UPDATE_CACHED_RESPONSE_COMPLETE,
     STATE_OVERWRITE_CACHED_RESPONSE,
     STATE_TRUNCATE_CACHED_DATA,
     STATE_TRUNCATE_CACHED_DATA_COMPLETE,
     STATE_TRUNCATE_CACHED_METADATA,
     STATE_TRUNCATE_CACHED_METADATA_COMPLETE,
     STATE_PARTIAL_HEADERS_RECEIVED,
     STATE_CACHE_READ_RESPONSE,
     STATE_CACHE_READ_RESPONSE_COMPLETE,
+    STATE_TOGGLE_UNUSED_SINCE_PREFETCH,
+    STATE_TOGGLE_UNUSED_SINCE_PREFETCH_COMPLETE,
     STATE_CACHE_WRITE_RESPONSE,
     STATE_CACHE_WRITE_TRUNCATED_RESPONSE,
     STATE_CACHE_WRITE_RESPONSE_COMPLETE,
     STATE_CACHE_READ_METADATA,
     STATE_CACHE_READ_METADATA_COMPLETE,
     STATE_CACHE_QUERY_DATA,
     STATE_CACHE_QUERY_DATA_COMPLETE,
     STATE_CACHE_READ_DATA,
     STATE_CACHE_READ_DATA_COMPLETE,
     STATE_CACHE_WRITE_DATA,
@@ skipping 51 matching lines @@
   int DoUpdateCachedResponse();
   int DoUpdateCachedResponseComplete(int result);
   int DoOverwriteCachedResponse();
   int DoTruncateCachedData();
   int DoTruncateCachedDataComplete(int result);
   int DoTruncateCachedMetadata();
   int DoTruncateCachedMetadataComplete(int result);
   int DoPartialHeadersReceived();
   int DoCacheReadResponse();
   int DoCacheReadResponseComplete(int result);
+  int DoCacheToggleUnusedSincePrefetch();
+  int DoCacheToggleUnusedSincePrefetchComplete(int result);
   int DoCacheWriteResponse();
   int DoCacheWriteTruncatedResponse();
   int DoCacheWriteResponseComplete(int result);
   int DoCacheReadMetadata();
   int DoCacheReadMetadataComplete(int result);
   int DoCacheQueryData();
   int DoCacheQueryDataComplete(int result);
   int DoCacheReadData();
   int DoCacheReadDataComplete(int result);
   int DoCacheWriteData(int num_bytes);
@@ skipping 101 matching lines @@
   // transaction should be restarted.
   int OnCacheReadError(int result, bool restart);
 
   // Called when the cache lock timeout fires.
   void OnAddToEntryTimeout(base::TimeTicks start_time);
 
   // Deletes the current partial cache entry (sparse), and optionally removes
   // the control object (partial_).
   void DoomPartialEntry(bool delete_object);
 
+  // Determines the next state to move to after reading a response from the
+  // cache based on the (mode_).
+  int DoCacheReadResponseCompleteContinuation();
+
   // Performs the needed work after receiving data from the network, when
   // working with range requests.
   int DoPartialNetworkReadCompleted(int result);
 
   // Performs the needed work after receiving data from the cache, when
   // working with range requests.
   int DoPartialCacheReadCompleted(int result);
 
   // Restarts this transaction after deleting the cached data. It is meant to
   // be used when the current request cannot be fulfilled due to conflicts
@@ skipping 79 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_