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 81676ebd420430ce5d405cb2c27884f7f83e9039..eeb4c4f9b92d2dba1f7085be8ad6351ddb6b55a2 100644
--- a/net/disk_cache/disk_cache.cc
+++ b/net/disk_cache/disk_cache.cc
@@ -187,4 +187,10 @@ int Backend::CalculateSizeOfEntriesBetween(base::Time initial_time,
   return net::ERR_NOT_IMPLEMENTED;
 }
 
+uint8_t Backend::GetMemoryEntryData(const std::string& key) {
+  return 0;
+}
+
+void Backend::SetMemoryEntryData(const std::string& key, uint8_t data) {}
+
 }  // namespace disk_cache