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diff --git a/chromium/net/disk_cache/v3/block_bitmaps.h b/chromium/net/disk_cache/v3/block_bitmaps.h
new file mode 100644
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+++ b/chromium/net/disk_cache/v3/block_bitmaps.h
@@ -0,0 +1,75 @@
+// 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.
+
+#ifndef NET_DISK_CACHE_BLOCK_FILES_H_
+#define NET_DISK_CACHE_BLOCK_FILES_H_
+
+#include <vector>
+
+#include "base/files/file_path.h"
+#include "base/gtest_prod_util.h"
+#include "base/memory/scoped_ptr.h"
+#include "net/base/net_export.h"
+#include "net/disk_cache/addr.h"
+#include "net/disk_cache/mapped_file.h"
+
+namespace disk_cache {
+
+// This class handles the set of block-files open by the disk cache.
+class NET_EXPORT_PRIVATE BlockFiles {
+ public:
+  explicit BlockFiles(const base::FilePath& path);
+  ~BlockFiles();
+
+  // Performs the object initialization. create_files indicates if the backing
+  // files should be created or just open.
+  bool Init(bool create_files);
+
+  // Creates a new entry on a block file. block_type indicates the size of block
+  // to be used (as defined on cache_addr.h), block_count is the number of
+  // blocks to allocate, and block_address is the address of the new entry.
+  bool CreateBlock(FileType block_type, int block_count, Addr* block_address);
+
+  // Removes an entry from the block files. If deep is true, the storage is zero
+  // filled; otherwise the entry is removed but the data is not altered (must be
+  // already zeroed).
+  void DeleteBlock(Addr address, bool deep);
+
+  // Close all the files and set the internal state to be initializad again. The
+  // cache is being purged.
+  void CloseFiles();
+
+  // Sends UMA stats.
+  void ReportStats();
+
+  // Returns true if the blocks pointed by a given address are currently used.
+  // This method is only intended for debugging.
+  bool IsValid(Addr address);
+
+ private:
+  // Returns the file that stores a given address.
+  MappedFile* GetFile(Addr address);
+
+  // Attemp to grow this file. Fails if the file cannot be extended anymore.
+  bool GrowBlockFile(MappedFile* file, BlockFileHeader* header);
+
+  // Returns the appropriate file to use for a new block.
+  MappedFile* FileForNewBlock(FileType block_type, int block_count);
+
+  // Restores the header of a potentially inconsistent file.
+  bool FixBlockFileHeader(MappedFile* file);
+
+  // Retrieves stats for the given file index.
+  void GetFileStats(int index, int* used_count, int* load);
+
+  bool init_;
+
+  DISALLOW_COPY_AND_ASSIGN(BlockFiles);
+};
+
+}  // namespace disk_cache
+
+#endif  // NET_DISK_CACHE_BLOCK_FILES_H_