Add the navigation redirect-chain to Sync sessions proto for offline analysis.

sync/protocol/proto_value_conversions.cc

Index: sync/protocol/proto_value_conversions.cc
diff --git a/sync/protocol/proto_value_conversions.cc b/sync/protocol/proto_value_conversions.cc
index 135842005e8c77dff240d7a3e8f83061c13c040b..bce114e5c0b073f9ee4ae9020098b8c531d28e27 100644
--- a/sync/protocol/proto_value_conversions.cc
+++ b/sync/protocol/proto_value_conversions.cc
@@ -205,6 +205,15 @@ base::DictionaryValue* TabNavigationToValue(
   SET_INT32(http_status_code);
   SET_INT32(referrer_policy);
   SET_BOOL(is_restored);
+  SET_REP(navigation_redirect, NavigationRedirectToValue);
+  SET_STR(last_navigation_redirect_url);
+  return value;
+}
+
+base::DictionaryValue* NavigationRedirectToValue(
+    const sync_pb::NavigationRedirect& proto) {
+  base::DictionaryValue* value = new base::DictionaryValue();
+  SET_STR(url);
   return value;
 }