Add the referrer policy to the page state

content/public/renderer/history_item_serialization.cc

Index: content/public/renderer/history_item_serialization.cc
diff --git a/content/public/renderer/history_item_serialization.cc b/content/public/renderer/history_item_serialization.cc
index 96309c954d28115538fe6c74a816392acb493493..1c4c1dd04fcf1064ed81346b3d9a9b2cef42859a 100644
--- a/content/public/renderer/history_item_serialization.cc
+++ b/content/public/renderer/history_item_serialization.cc
@@ -84,6 +84,7 @@ bool RecursivelyGenerateFrameState(const WebHistoryItem& item,
   state->url_string = item.urlString();
   state->original_url_string = item.originalURLString();
   state->referrer = item.referrer();
+  state->referrer_policy = item.referrerPolicy();
   state->target = item.target();
   if (!item.stateObject().isNull())
     state->state_object = item.stateObject().toString();
@@ -122,7 +123,7 @@ bool RecursivelyGenerateHistoryItem(const ExplodedFrameState& state,
                                     WebHistoryItem* item) {
   item->setURLString(state.url_string);
   item->setOriginalURLString(state.original_url_string);
-  item->setReferrer(state.referrer);
+  item->setReferrer(state.referrer, state.referrer_policy);
   item->setTarget(state.target);
   if (!state.state_object.is_null()) {
     item->setStateObject(