Persist offline page info in a navigation entry if needed

components/sessions/core/serialized_navigation_entry.cc

Index: components/sessions/core/serialized_navigation_entry.cc
diff --git a/components/sessions/core/serialized_navigation_entry.cc b/components/sessions/core/serialized_navigation_entry.cc
index 4f4124c598a5e7c50be2ed812a71946ec0aa6b33..430f28b6fdf73c051f51c32dbadc5b617240ca4f 100644
--- a/components/sessions/core/serialized_navigation_entry.cc
+++ b/components/sessions/core/serialized_navigation_entry.cc
@@ -213,6 +213,7 @@ enum TypeMask {
 // search_terms_
 // http_status_code_
 // referrer_policy_
+// offline_page_info_
 
 void SerializedNavigationEntry::WriteToPickle(int max_size,
                                               base::Pickle* pickle) const {
@@ -257,6 +258,8 @@ void SerializedNavigationEntry::WriteToPickle(int max_size,
   pickle->WriteInt(http_status_code_);
 
   pickle->WriteInt(referrer_policy_);
+
+  WriteStringToPickle(pickle, &bytes_written, max_size, offline_page_info_);
 }
 
 bool SerializedNavigationEntry::ReadFromPickle(base::PickleIterator* iterator) {
@@ -335,6 +338,9 @@ bool SerializedNavigationEntry::ReadFromPickle(base::PickleIterator* iterator) {
           SerializedNavigationDriver::Get()->StripReferrerFromPageState(
               encoded_page_state_);
     }
+
+    if (!iterator->ReadString(&offline_page_info_))
+      offline_page_info_ = std::string();
   }
 
   SerializedNavigationDriver::Get()->Sanitize(this);