Interface for associating in-memory hint bytes with disk cache entries.

net/disk_cache/disk_cache.cc

Index: net/disk_cache/disk_cache.cc
diff --git a/net/disk_cache/disk_cache.cc b/net/disk_cache/disk_cache.cc
index e860aef78811f41d08443802fd532c550a8c2129..345a649e8b5875665d3c73cb952763bd13d12053 100644
--- a/net/disk_cache/disk_cache.cc
+++ b/net/disk_cache/disk_cache.cc
@@ -292,4 +292,10 @@ int Backend::CalculateSizeOfEntriesBetween(base::Time initial_time,
   return net::ERR_NOT_IMPLEMENTED;
 }
 
+uint8_t Backend::GetEntryInMemoryData(const std::string& key) {
+  return 0;
+}
+
+void Backend::SetEntryInMemoryData(const std::string& key, uint8_t data) {}
+
 }  // namespace disk_cache