Persist offline page info in a navigation entry if needed

components/sessions/ios/ios_serialized_navigation_driver.cc

Index: components/sessions/ios/ios_serialized_navigation_driver.cc
diff --git a/components/sessions/ios/ios_serialized_navigation_driver.cc b/components/sessions/ios/ios_serialized_navigation_driver.cc
index ba195b52d1556ff67007f1a22ef44459e7bb9d40..33520fa7a3ae67d62b96daf27196071c72bec5dc 100644
--- a/components/sessions/ios/ios_serialized_navigation_driver.cc
+++ b/components/sessions/ios/ios_serialized_navigation_driver.cc
@@ -136,4 +136,16 @@ std::string IOSSerializedNavigationDriver::StripReferrerFromPageState(
   return std::string();
 }
 
+void IOSSerializedNavigationDriver::RegisterExtendedInfoHandler(
+    const std::string& key,
+    std::unique_ptr<ExtendedInfoHandler> handler) {
+  DCHECK(!key.empty());
+  extended_info_handler_map_[key] = std::move(handler);
+}
+
+const SerializedNavigationDriver::ExtendedInfoHandlerMap&
+IOSSerializedNavigationDriver::GetAllExtendedInfoHandlers() const {
+  return extended_info_handler_map_;
+}
+
 }  // namespace sessions