Add a size estimation mechanism to StoragePartitionHttpCacheDataRemover.

net/disk_cache/simple/simple_entry_impl.cc

 // 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.
 
 #include "net/disk_cache/simple/simple_entry_impl.h"
 
 #include <algorithm>
 #include <cstring>
 #include <vector>
 
@@ skipping 321 matching lines @@
   DCHECK(io_thread_checker_.CalledOnValidThread());
   return last_modified_;
 }
 
 int32 SimpleEntryImpl::GetDataSize(int stream_index) const {
   DCHECK(io_thread_checker_.CalledOnValidThread());
   DCHECK_LE(0, data_size_[stream_index]);
   return data_size_[stream_index];
 }
 
+int SimpleEntryImpl::GetEntrySize() const {
+  DCHECK(io_thread_checker_.CalledOnValidThread());
+  int result = 0;
+  for (int i = 0; i < kSimpleEntryStreamCount; ++i)
+    result += GetDataSize(i);
+  return result;
+}
+
 int SimpleEntryImpl::ReadData(int stream_index,
                               int offset,
                               net::IOBuffer* buf,
                               int buf_len,
                               const CompletionCallback& callback) {
   DCHECK(io_thread_checker_.CalledOnValidThread());
 
   if (net_log_.IsCapturing()) {
     net_log_.AddEvent(net::NetLog::TYPE_SIMPLE_CACHE_ENTRY_READ_CALL,
         CreateNetLogReadWriteDataCallback(stream_index, offset, buf_len,
@@ skipping 1166 matching lines @@
     }
     crc32s_end_offset_[stream_index] = offset + length;
   } else if (offset < crc32s_end_offset_[stream_index]) {
     // If a range for which the crc32 was already computed is rewritten, the
     // computation of the crc32 need to start from 0 again.
     crc32s_end_offset_[stream_index] = 0;
   }
 }
 
 }  // namespace disk_cache