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diff --git a/net/disk_cache/stats.h b/net/disk_cache/stats.h
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef NET_DISK_CACHE_STATS_H__
+#define NET_DISK_CACHE_STATS_H__
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+
+namespace disk_cache {
+
+class BackendImpl;
+
+typedef std::vector<std::pair<std::string, std::string> > StatsItems;
+
+// This class stores cache-specific usage information, for tunning purposes.
+class Stats {
+ public:
+  static const int kDataSizesLength = 28;
+  enum Counters {
+    MIN_COUNTER = 0,
+    OPEN_MISS = MIN_COUNTER,
+    OPEN_HIT,
+    CREATE_MISS,
+    CREATE_HIT,
+    CREATE_ERROR,
+    TRIM_ENTRY,
+    DOOM_ENTRY,
+    DOOM_CACHE,
+    INVALID_ENTRY,
+    OPEN_ENTRIES,  // Average number of open entries.
+    MAX_ENTRIES,  // Maximum number of open entries.
+    TIMER,
+    READ_DATA,
+    WRITE_DATA,
+    OPEN_RANKINGS,  // An entry has to be read just to modify rankings.
+    GET_RANKINGS,  // We got the ranking info without reading the whole entry.
+    FATAL_ERROR,
+    MAX_COUNTER
+  };
+
+  Stats() : backend_(NULL) {}
+  ~Stats();
+
+  bool Init(BackendImpl* backend, uint32* storage_addr);
+
+  // Tracks changes to the stoage space used by an entry.
+  void ModifyStorageStats(int32 old_size, int32 new_size);
+
+  // Tracks general events.
+  void OnEvent(Counters an_event);
+  void SetCounter(Counters counter, int64 value);
+  int64 GetCounter(Counters counter) const;
+
+  void GetItems(StatsItems* items);
+
+ private:
+  int GetStatsBucket(int32 size);
+
+  BackendImpl* backend_;
+  uint32 storage_addr_;
+  int data_sizes_[kDataSizesLength];
+  int64 counters_[MAX_COUNTER];
+
+  DISALLOW_EVIL_CONSTRUCTORS(Stats);
+};
+
+}  // namespace disk_cache
+
+#endif  // NET_DISK_CACHE_STATS_H__