Refactor cache counting into a separate helper class

net/disk_cache/memory/mem_entry_impl.cc

Index: net/disk_cache/memory/mem_entry_impl.cc
diff --git a/net/disk_cache/memory/mem_entry_impl.cc b/net/disk_cache/memory/mem_entry_impl.cc
index cfe23e75cf70066caf36a89ec77b05ded1f5af03..1d73aefefd0d377105105b9094a58b12b8e4b32c 100644
--- a/net/disk_cache/memory/mem_entry_impl.cc
+++ b/net/disk_cache/memory/mem_entry_impl.cc
@@ -165,6 +165,14 @@ int32_t MemEntryImpl::GetDataSize(int index) const {
   return data_[index].size();
 }
 
+int64_t MemEntryImpl::GetEntrySize() const {
+  int64_t size = key_.size();
+  for (int i = 0; i < kNumStreams; ++i) {
+    size += GetDataSize(i);
+  }
+  return size;
+}
+
 int MemEntryImpl::ReadData(int index, int offset, IOBuffer* buf, int buf_len,
                            const CompletionCallback& callback) {
   if (net_log_.IsCapturing()) {