Disk cache: Add base files for implementation of file format version 3.

net/disk_cache/v3/block_bitmaps.h

Index: net/disk_cache/v3/block_bitmaps.h
===================================================================
--- net/disk_cache/v3/block_bitmaps.h	(revision 0)
+++ net/disk_cache/v3/block_bitmaps.h	(working copy)
@@ -16,10 +16,6 @@
 #include "net/disk_cache/addr.h"
 #include "net/disk_cache/mapped_file.h"
 
-namespace base {
-class ThreadChecker;
-}
-
 namespace disk_cache {
 
 // This class handles the set of block-files open by the disk cache.
@@ -57,45 +53,20 @@
   bool IsValid(Addr address);
 
  private:
-  // Set force to true to overwrite the file if it exists.
-  bool CreateBlockFile(int index, FileType file_type, bool force);
-  bool OpenBlockFile(int index);
-
   // 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);
 
-  // Returns the next block file on this chain, creating new files if needed.
-  MappedFile* NextFile(MappedFile* file);
-
-  // Creates an empty block file and returns its index.
-  int CreateNextBlockFile(FileType block_type);
-
-  // Removes a chained block file that is now empty.
-  bool RemoveEmptyFile(FileType block_type);
-
   // 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);
 
-  // Returns the filename for a given file index.
-  base::FilePath Name(int index);
-
   bool init_;
-  char* zero_buffer_;  // Buffer to speed-up cleaning deleted entries.
-  base::FilePath path_;  // Path to the backing folder.
-  std::vector<MappedFile*> block_files_;  // The actual files.
-  scoped_ptr<base::ThreadChecker> thread_checker_;
 
-  FRIEND_TEST_ALL_PREFIXES(DiskCacheTest, BlockFiles_ZeroSizeFile);
-  FRIEND_TEST_ALL_PREFIXES(DiskCacheTest, BlockFiles_TruncatedFile);
-  FRIEND_TEST_ALL_PREFIXES(DiskCacheTest, BlockFiles_InvalidFile);
-  FRIEND_TEST_ALL_PREFIXES(DiskCacheTest, BlockFiles_Stats);
-
   DISALLOW_COPY_AND_ASSIGN(BlockFiles);
 };