RFC: use some in-memory state in SimpleCache to quickly cache-miss some CantConditionalize cases

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..0256b25c570beb3c1ef15cf5d455c7ad4e86c307 100644
--- a/net/disk_cache/disk_cache.cc
+++ b/net/disk_cache/disk_cache.cc
@@ -181,10 +181,19 @@ int CreateCacheBackend(
   return creator->Run();
 }
 
+int Backend::OpenEntryWithOracleByte(const std::string& key,
+                                     Entry** entry,
+                                     const OracleCallback& oracle,
+                                     const CompletionCallback& callback) {
+  return OpenEntry(key, entry, callback);
+}
+
 int Backend::CalculateSizeOfEntriesBetween(base::Time initial_time,
                                            base::Time end_time,
                                            const CompletionCallback& callback) {
   return net::ERR_NOT_IMPLEMENTED;
 }
 
+void Entry::SetOracleByte(uint8_t) {}
+
 }  // namespace disk_cache