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diff --git a/net/disk_cache/mapped_file.h b/net/disk_cache/mapped_file.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.
+
+// See net/disk_cache/disk_cache.h for the public interface of the cache.
+
+#ifndef NET_DISK_CACHE_MAPPED_FILE_H__
+#define NET_DISK_CACHE_MAPPED_FILE_H__
+
+#include "base/ref_counted.h"
+#include "net/disk_cache/disk_format.h"
+#include "net/disk_cache/file.h"
+#include "net/disk_cache/file_block.h"
+
+namespace disk_cache {
+
+// This class implements a memory mapped file used to access block-files. The
+// idea is that the header and bitmap will be memory mapped all the time, and
+// the actual data for the blocks will be access asynchronously (most of the
+// time).
+class MappedFile : public File {
+ public:
+  MappedFile() : init_(false), File(true) {}
+
+  // Performs object initialization. name is the file to use, and size is the
+  // ammount of data to memory map from th efile. If size is 0, the whole file
+  // will be mapped in memory.
+  void* Init(const std::wstring name, size_t size);
+
+  void* buffer() const {
+    return buffer_;
+  }
+
+  // Loads or stores a given block from the backing file (synchronously).
+  bool Load(const FileBlock* block);
+  bool Store(const FileBlock* block);
+
+ protected:
+  virtual ~MappedFile();
+
+ private:
+  bool init_;
+  HANDLE section_;
+  void* buffer_;  // Address of the memory mapped buffer.
+  size_t view_size_;  // Size of the memory pointed by buffer_.
+
+  DISALLOW_EVIL_CONSTRUCTORS(MappedFile);
+};
+
+}  // namespace disk_cache
+
+#endif  // NET_DISK_CACHE_MAPPED_FILE_H__