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diff --git a/chromium/net/disk_cache/mem_backend_impl.h b/chromium/net/disk_cache/mem_backend_impl.h
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+++ b/chromium/net/disk_cache/mem_backend_impl.h
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+// 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.
+
+// See net/disk_cache/disk_cache.h for the public interface of the cache.
+
+#ifndef NET_DISK_CACHE_MEM_BACKEND_IMPL_H__
+#define NET_DISK_CACHE_MEM_BACKEND_IMPL_H__
+
+#include "base/compiler_specific.h"
+#include "base/containers/hash_tables.h"
+#include "net/disk_cache/disk_cache.h"
+#include "net/disk_cache/mem_rankings.h"
+
+namespace net {
+class NetLog;
+}  // namespace net
+
+namespace disk_cache {
+
+class MemEntryImpl;
+
+// This class implements the Backend interface. An object of this class handles
+// the operations of the cache without writing to disk.
+class NET_EXPORT_PRIVATE MemBackendImpl : public Backend {
+ public:
+  explicit MemBackendImpl(net::NetLog* net_log);
+  virtual ~MemBackendImpl();
+
+  // Returns an instance of a Backend implemented only in memory. The returned
+  // object should be deleted when not needed anymore. max_bytes is the maximum
+  // size the cache can grow to. If zero is passed in as max_bytes, the cache
+  // will determine the value to use based on the available memory. The returned
+  // pointer can be NULL if a fatal error is found.
+  static scoped_ptr<Backend> CreateBackend(int max_bytes, net::NetLog* net_log);
+
+  // Performs general initialization for this current instance of the cache.
+  bool Init();
+
+  // Sets the maximum size for the total amount of data stored by this instance.
+  bool SetMaxSize(int max_bytes);
+
+  // Permanently deletes an entry.
+  void InternalDoomEntry(MemEntryImpl* entry);
+
+  // Updates the ranking information for an entry.
+  void UpdateRank(MemEntryImpl* node);
+
+  // A user data block is being created, extended or truncated.
+  void ModifyStorageSize(int32 old_size, int32 new_size);
+
+  // Returns the maximum size for a file to reside on the cache.
+  int MaxFileSize() const;
+
+  // Insert an MemEntryImpl into the ranking list. This method is only called
+  // from MemEntryImpl to insert child entries. The reference can be removed
+  // by calling RemoveFromRankingList(|entry|).
+  void InsertIntoRankingList(MemEntryImpl* entry);
+
+  // Remove |entry| from ranking list. This method is only called from
+  // MemEntryImpl to remove a child entry from the ranking list.
+  void RemoveFromRankingList(MemEntryImpl* entry);
+
+  // Backend interface.
+  virtual net::CacheType GetCacheType() const OVERRIDE;
+  virtual int32 GetEntryCount() const OVERRIDE;
+  virtual int OpenEntry(const std::string& key, Entry** entry,
+                        const CompletionCallback& callback) OVERRIDE;
+  virtual int CreateEntry(const std::string& key, Entry** entry,
+                          const CompletionCallback& callback) OVERRIDE;
+  virtual int DoomEntry(const std::string& key,
+                        const CompletionCallback& callback) OVERRIDE;
+  virtual int DoomAllEntries(const CompletionCallback& callback) OVERRIDE;
+  virtual int DoomEntriesBetween(base::Time initial_time,
+                                 base::Time end_time,
+                                 const CompletionCallback& callback) OVERRIDE;
+  virtual int DoomEntriesSince(base::Time initial_time,
+                               const CompletionCallback& callback) OVERRIDE;
+  virtual int OpenNextEntry(void** iter, Entry** next_entry,
+                            const CompletionCallback& callback) OVERRIDE;
+  virtual void EndEnumeration(void** iter) OVERRIDE;
+  virtual void GetStats(
+      std::vector<std::pair<std::string, std::string> >* stats) OVERRIDE {}
+  virtual void OnExternalCacheHit(const std::string& key) OVERRIDE;
+
+ private:
+  typedef base::hash_map<std::string, MemEntryImpl*> EntryMap;
+
+  // Old Backend interface.
+  bool OpenEntry(const std::string& key, Entry** entry);
+  bool CreateEntry(const std::string& key, Entry** entry);
+  bool DoomEntry(const std::string& key);
+  bool DoomAllEntries();
+  bool DoomEntriesBetween(const base::Time initial_time,
+                          const base::Time end_time);
+  bool DoomEntriesSince(const base::Time initial_time);
+  bool OpenNextEntry(void** iter, Entry** next_entry);
+
+  // Deletes entries from the cache until the current size is below the limit.
+  // If empty is true, the whole cache will be trimmed, regardless of being in
+  // use.
+  void TrimCache(bool empty);
+
+  // Handles the used storage count.
+  void AddStorageSize(int32 bytes);
+  void SubstractStorageSize(int32 bytes);
+
+  EntryMap entries_;
+  MemRankings rankings_;  // Rankings to be able to trim the cache.
+  int32 max_size_;        // Maximum data size for this instance.
+  int32 current_size_;
+
+  net::NetLog* net_log_;
+
+  DISALLOW_COPY_AND_ASSIGN(MemBackendImpl);
+};
+
+}  // namespace disk_cache
+
+#endif  // NET_DISK_CACHE_MEM_BACKEND_IMPL_H__