Reland of Implement cache counting for the simple and memory backends - with fixed test.

net/disk_cache/simple/simple_index.h

 // Copyright (c) 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_INDEX_H_
 #define NET_DISK_CACHE_SIMPLE_SIMPLE_INDEX_H_
 
 #include <list>
 #include <vector>
 
@@ skipping 112 matching lines @@
   // disk cache backend interface.
   scoped_ptr<HashList> GetEntriesBetween(const base::Time initial_time,
                                          const base::Time end_time);
 
   // Returns the list of all entries key hash.
   scoped_ptr<HashList> GetAllHashes();
 
   // Returns number of indexed entries.
   int32 GetEntryCount() const;
 
+  // Returns the size of the entire cache in bytes. Can only be called after the
+  // index has been initialized.
+  uint64 GetCacheSize() const;
+
   // Returns whether the index has been initialized yet.
   bool initialized() const { return initialized_; }
 
  private:
   friend class SimpleIndexTest;
   FRIEND_TEST_ALL_PREFIXES(SimpleIndexTest, IndexSizeCorrectOnMerge);
   FRIEND_TEST_ALL_PREFIXES(SimpleIndexTest, DiskWriteQueued);
   FRIEND_TEST_ALL_PREFIXES(SimpleIndexTest, DiskWriteExecuted);
   FRIEND_TEST_ALL_PREFIXES(SimpleIndexTest, DiskWritePostponed);
 
@@ skipping 52 matching lines @@
 
   // Set to true when the app is on the background. When the app is in the
   // background we can write the index much more frequently, to insure fresh
   // index on next startup.
   bool app_on_background_;
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_SIMPLE_SIMPLE_INDEX_H_