Simplify directory path accounting.

webkit/fileapi/obfuscated_file_system_file_util.h

 // Copyright (c) 2011 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.
 
 #ifndef WEBKIT_FILEAPI_OBFUSCATED_FILE_SYSTEM_FILE_UTIL_H_
 #define WEBKIT_FILEAPI_OBFUSCATED_FILE_SYSTEM_FILE_UTIL_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 167 matching lines @@
   AbstractOriginEnumerator* CreateOriginEnumerator();
 
   virtual AbstractFileEnumerator* CreateFileEnumerator(
       FileSystemOperationContext* context,
       const FilePath& root_path) OVERRIDE;
 
   // Deletes a directory database from the database list in the ObfuscatedFSFU
   // and destroys the database on the disk.
   bool DestroyDirectoryDatabase(const GURL& origin, FileSystemType type);
 
+  // Computes a cost for storing a given file in the obfuscated FSFU.
+  // As the cost of a file is independent of the cost of its parent directories,
+  // this ignores all but the BaseName of the supplied path.  In order to
+  // compute the cost of adding a multi-segment directory recursively, call this
+  // on each path segment and add the results.
+  static int64 ComputeFilePathCost(const FilePath& path);
+
  private:
   typedef FileSystemDirectoryDatabase::FileId FileId;
   typedef FileSystemDirectoryDatabase::FileInfo FileInfo;
 
   base::PlatformFileError GetFileInfoInternal(
       FileSystemDirectoryDatabase* db,
       FileSystemOperationContext* context,
       FileId file_id,
       FileInfo* local_info,
       base::PlatformFileInfo* file_info,
@@ skipping 49 matching lines @@
   FilePath file_system_directory_;
   base::OneShotTimer<ObfuscatedFileSystemFileUtil> timer_;
   scoped_ptr<FileSystemFileUtil> underlying_file_util_;
 
   DISALLOW_COPY_AND_ASSIGN(ObfuscatedFileSystemFileUtil);
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_OBFUSCATED_FILE_SYSTEM_FILE_UTIL_H_