Add title update merge logic to reading list entry

components/reading_list/ios/reading_list_store.cc

Index: components/reading_list/ios/reading_list_store.cc
diff --git a/components/reading_list/ios/reading_list_store.cc b/components/reading_list/ios/reading_list_store.cc
index a115eec20f90cdf75f50c9021bc67aec1110ca2b..fd02b5ccb6bd313e6bf5431198e6ef0c66241732 100644
--- a/components/reading_list/ios/reading_list_store.cc
+++ b/components/reading_list/ios/reading_list_store.cc
@@ -418,6 +418,8 @@ bool ReadingListStore::CompareEntriesForSync(
   DCHECK(lhs.entry_id() == rhs.entry_id());
   DCHECK(lhs.has_update_time_us());
   DCHECK(rhs.has_update_time_us());
+  DCHECK(lhs.has_update_title_time_us());
+  DCHECK(rhs.has_update_title_time_us());
   DCHECK(lhs.has_creation_time_us());
   DCHECK(rhs.has_creation_time_us());
   DCHECK(lhs.has_url());
@@ -426,7 +428,8 @@ bool ReadingListStore::CompareEntriesForSync(
   DCHECK(rhs.has_title());
   DCHECK(lhs.has_status());
   DCHECK(rhs.has_status());
-  if (rhs.url() != lhs.url() || rhs.title().compare(lhs.title()) < 0 ||
+  if (rhs.url() != lhs.url() ||
+      rhs.update_title_time_us() < lhs.update_title_time_us() ||
       rhs.creation_time_us() < lhs.creation_time_us() ||
       rhs.update_time_us() < lhs.update_time_us()) {
     return false;
@@ -438,6 +441,10 @@ bool ReadingListStore::CompareEntriesForSync(
          lhs.status() == sync_pb::ReadingListSpecifics::READ))
       return false;
   }
+  if (rhs.update_title_time_us() == lhs.update_title_time_us()) {
+    if (rhs.title().compare(lhs.title()) < 0)
+      return false;
+  }
   if (rhs.creation_time_us() == lhs.creation_time_us()) {
     if (rhs.first_read_time_us() == 0 && lhs.first_read_time_us() != 0) {
       return false;