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

net/disk_cache/disk_cache.h

Index: net/disk_cache/disk_cache.h
diff --git a/net/disk_cache/disk_cache.h b/net/disk_cache/disk_cache.h
index f71bc81964b929f4dce5596d724c41bf36429279..2a1f3e25206c38545b7c0c0ecd7d74ca815cdb89 100644
--- a/net/disk_cache/disk_cache.h
+++ b/net/disk_cache/disk_cache.h
@@ -190,6 +190,9 @@ class NET_EXPORT Entry {
   // 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