Refactor cache counting into a separate helper class

net/disk_cache/blockfile/entry_impl.cc

Index: net/disk_cache/blockfile/entry_impl.cc
diff --git a/net/disk_cache/blockfile/entry_impl.cc b/net/disk_cache/blockfile/entry_impl.cc
index 562efdf63f2a2a155ad8a3f938a11a805726aa05..75bfe92caee8912014e5a0d7515ae86c9ed24db4 100644
--- a/net/disk_cache/blockfile/entry_impl.cc
+++ b/net/disk_cache/blockfile/entry_impl.cc
@@ -820,6 +820,14 @@ int32_t EntryImpl::GetDataSize(int index) const {
   return entry->Data()->data_size[index];
 }
 
+int64_t EntryImpl::GetEntrySize() const {
+  int64_t size = GetKey().size();
+  for (int i = 0; i < kNumStreams; ++i) {
+    size += GetDataSize(i);
+  }
+  return size;
+}
+
 int EntryImpl::ReadData(int index, int offset, IOBuffer* buf, int buf_len,
                         const CompletionCallback& callback) {
   if (callback.is_null())