Implement a method to get the total size of a cache entry

net/disk_cache/disk_cache.h

 // 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.
 
 // Defines the public interface of the disk cache. For more details see
 // http://dev.chromium.org/developers/design-documents/network-stack/disk-cache
 
 #ifndef NET_DISK_CACHE_DISK_CACHE_H_
 #define NET_DISK_CACHE_DISK_CACHE_H_
 
@@ skipping 172 matching lines @@
 
   // Returns the time when this cache entry was last used.
   virtual base::Time GetLastUsed() const = 0;
 
   // Returns the time when this cache entry was last modified.
   virtual base::Time GetLastModified() const = 0;
 
   // Returns the size of the cache data with the given index.
   virtual int32_t GetDataSize(int index) const = 0;
 
+  // Return size of all data streams, the key and other metadata.
+  virtual int64_t GetEntrySize() const = 0;
+
   // Copies cached data into the given buffer of length |buf_len|. Returns the
   // number of bytes read or a network error code. If this function returns
   // ERR_IO_PENDING, the completion callback will be called on the current
   // thread when the operation completes, and a reference to |buf| will be
   // retained until the callback is called. Note that as long as the function
   // does not complete immediately, the callback will always be invoked, even
   // after Close has been called; in other words, the caller may close this
   // entry without having to wait for all the callbacks, and still rely on the
   // cleanup performed from the callback code.
   virtual int ReadData(int index, int offset, IOBuffer* buf, int buf_len,
@@ skipping 128 matching lines @@
     entry->Close();
   }
 };
 
 // Automatically closes an entry when it goes out of scope.
 typedef std::unique_ptr<Entry, EntryDeleter> ScopedEntryPtr;
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_DISK_CACHE_H_