SimpleCache: open with fewer seeks.

net/disk_cache/simple/simple_test_util.h

 // Copyright 2013 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 NET_DISK_CACHE_SIMPLE_SIMPLE_TEST_UTIL_H_
 #define NET_DISK_CACHE_SIMPLE_SIMPLE_TEST_UTIL_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 25 matching lines @@
   }
 
  private:
   T data_[size];
 };
 
 // Creates a corrupt file to be used in tests.
 bool CreateCorruptFileForTests(const std::string& key,
                                const base::FilePath& cache_path);
 
+// Removes the key SHA256 from an entry.
+bool RemoveKeySHA256FromEntry(const std::string& key,
+                              const base::FilePath& cache_path);
+
+// Modifies the key SHA256 from an entry so that it is corrupt.
+bool CorruptKeySHA256FromEntry(const std::string& key,
+                               const base::FilePath& cache_path);
+
 }  // namespace simple_backend
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_SIMPLE_SIMPLE_TEST_UTIL_H_