Update FrameNavigationEntry members when setting PageState.

content/browser/frame_host/frame_navigation_entry.cc

Index: content/browser/frame_host/frame_navigation_entry.cc
diff --git a/content/browser/frame_host/frame_navigation_entry.cc b/content/browser/frame_host/frame_navigation_entry.cc
index 26671f7df448e60a5c8fc0cf5bd8aa7927f11cb5..bf78bef31f702fbaab573adefe8f1bf4ea08f3ec 100644
--- a/content/browser/frame_host/frame_navigation_entry.cc
+++ b/content/browser/frame_host/frame_navigation_entry.cc
@@ -83,6 +83,17 @@ void FrameNavigationEntry::set_document_sequence_number(
   document_sequence_number_ = document_sequence_number;
 }
 
+void FrameNavigationEntry::SetPageState(const PageState& page_state) {
+  page_state_ = page_state;
+
+  ExplodedPageState exploded_state;
+  if (!DecodePageState(page_state_.ToEncodedData(), &exploded_state))
+    return;
+
+  item_sequence_number_ = exploded_state.top.item_sequence_number;
+  document_sequence_number_ = exploded_state.top.document_sequence_number;
+}
+
 scoped_refptr<ResourceRequestBodyImpl> FrameNavigationEntry::GetPostData()
     const {
   DCHECK(SiteIsolationPolicy::UseSubframeNavigationEntries());