Inform disk cache of WebKit memory cache hits.

net/http/http_cache.h

 // Copyright (c) 2011 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 a HttpTransactionFactory implementation that can be
 // layered on top of another HttpTransactionFactory to add HTTP caching.  The
 // caching logic follows RFC 2616 (any exceptions are called out in the code).
 //
 // The HttpCache takes a disk_cache::Backend as a parameter, and uses that for
 // the cache storage.
@@ skipping 161 matching lines @@
 
   // Get/Set the cache's mode.
   void set_mode(Mode value) { mode_ = value; }
   Mode mode() { return mode_; }
 
   // Close currently active sockets so that fresh page loads will not use any
   // recycled connections.  For sockets currently in use, they may not close
   // immediately, but they will not be reusable. This is for debugging.
   void CloseAllConnections();
 
+  // Called whenever an external cache in the system reuses the resource
+  // referred to by |url| and |http_method|.
+  void OnExternalCacheHit(const GURL& url, const std::string& http_method);
+
   // HttpTransactionFactory implementation:
   virtual int CreateTransaction(scoped_ptr<HttpTransaction>* trans);
   virtual HttpCache* GetCache();
   virtual HttpNetworkSession* GetSession();
 
  protected:
   // Disk cache entry data indices.
   enum {
     kResponseInfoIndex = 0,
     kResponseContentIndex,
@@ skipping 146 matching lines @@
   void OnProcessPendingQueue(ActiveEntry* entry);
 
   // Callbacks ----------------------------------------------------------------
 
   // Processes BackendCallback notifications.
   void OnIOComplete(int result, PendingOp* entry);
 
   // Processes the backend creation notification.
   void OnBackendCreated(int result, PendingOp* pending_op);
 
-
   // Variables ----------------------------------------------------------------
 
   NetLog* net_log_;
 
   // Used when lazily constructing the disk_cache_.
   scoped_ptr<BackendFactory> backend_factory_;
   bool building_backend_;
 
   Mode mode_;
 
@@ skipping 14 matching lines @@
   ScopedRunnableMethodFactory<HttpCache> task_factory_;
 
   scoped_ptr<PlaybackCacheMap> playback_cache_map_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpCache);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_CACHE_H_