Disk cache: Add support for an extra data stream for each cache entry....

net/disk_cache/mem_entry_impl.h

 // Copyright (c) 2006-2008 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.
 
 #ifndef NET_DISK_CACHE_MEM_ENTRY_IMPL_H__
 #define NET_DISK_CACHE_MEM_ENTRY_IMPL_H__
 
 #include "net/disk_cache/disk_cache.h"
 
 namespace disk_cache {
@@ skipping 39 matching lines @@
   }
 
   void set_prev(MemEntryImpl* prev) {
     prev_ = prev;
   }
 
   void Open();
   bool InUse();
 
  private:
+   enum {
+     NUM_STREAMS = 3
+   };
+
   ~MemEntryImpl();
 
   // Grows and cleans up the data buffer.
   void PrepareTarget(int index, int offset, int buf_len);
 
   // Updates ranking information.
   void UpdateRank(bool modified);
 
   std::string key_;
-  std::vector<char> data_[2];  // User data.
-  int32 data_size_[2];
+  std::vector<char> data_[NUM_STREAMS];  // User data.
+  int32 data_size_[NUM_STREAMS];
   int ref_count_;
 
   MemEntryImpl* next_;         // Pointers for the LRU list.
   MemEntryImpl* prev_;
   base::Time last_modified_;         // LRU information.
   base::Time last_used_;
   MemBackendImpl* backend_;    // Back pointer to the cache.
   bool doomed_;                // True if this entry was removed from the cache.
 
   DISALLOW_EVIL_CONSTRUCTORS(MemEntryImpl);
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_MEM_ENTRY_IMPL_H__