Add a size estimation mechanism to StoragePartitionHttpCacheDataRemover.

net/disk_cache/blockfile/entry_impl.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.
 
 #ifndef NET_DISK_CACHE_BLOCKFILE_ENTRY_IMPL_H_
 #define NET_DISK_CACHE_BLOCKFILE_ENTRY_IMPL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "net/disk_cache/blockfile/disk_format.h"
 #include "net/disk_cache/blockfile/storage_block-inl.h"
@@ skipping 128 matching lines @@
   // an end event to be logged on destruction.  The EntryImpl must have its key
   // initialized before this is called.  |created| is true if the Entry was
   // created rather than opened.
   void BeginLogging(net::NetLog* net_log, bool created);
 
   const net::BoundNetLog& net_log() const;
 
   // Returns the number of blocks needed to store an EntryStore.
   static int NumBlocksForEntry(int key_size);
 
+  // The total size of this entry; sum of |GetDataSize| for all streams.
+  int GetEntrySize() const;
+
   // Entry interface.
   void Doom() override;
   void Close() override;
   std::string GetKey() const override;
   base::Time GetLastUsed() const override;
   base::Time GetLastModified() const override;
   int32 GetDataSize(int index) const override;
   int ReadData(int index,
                int offset,
                IOBuffer* buf,
@@ skipping 122 matching lines @@
   scoped_ptr<SparseControl> sparse_;  // Support for sparse entries.
 
   net::BoundNetLog net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(EntryImpl);
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_BLOCKFILE_ENTRY_IMPL_H_