[Offline Pages] Feature flag to allow concurrent background loading on svelte

components/offline_pages/offline_page_feature.cc

Index: components/offline_pages/offline_page_feature.cc
diff --git a/components/offline_pages/offline_page_feature.cc b/components/offline_pages/offline_page_feature.cc
index c469846124d11c98ca28a60808c2173f253e38d4..c339d1c4eec42c44a03367806c354a06ad543eeb 100644
--- a/components/offline_pages/offline_page_feature.cc
+++ b/components/offline_pages/offline_page_feature.cc
@@ -29,6 +29,9 @@ const base::Feature kOfflinePagesCTFeature {
 const base::Feature kOfflinePagesSharingFeature{
     "OfflinePagesSharing", base::FEATURE_DISABLED_BY_DEFAULT};
 
+const base::Feature kOfflinePagesSvelteConcurrentLoadingFeature{
+    "OfflinePagesSvelteConcurrentLoading", base::FEATURE_DISABLED_BY_DEFAULT};
+
 const base::Feature kBackgroundLoaderForDownloadsFeature{
     "BackgroundLoadingForDownloads", base::FEATURE_ENABLED_BY_DEFAULT};
 
@@ -44,6 +47,11 @@ bool IsOfflinePagesBackgroundLoadingEnabled() {
   return base::FeatureList::IsEnabled(kOfflinePagesBackgroundLoadingFeature);
 }
 
+bool IsOfflinePagesSvelteConcurrentLoadingEnabled() {
+  return base::FeatureList::IsEnabled(
+      kOfflinePagesSvelteConcurrentLoadingFeature);
+}
+
 bool IsOfflinePagesCTEnabled() {
   return base::FeatureList::IsEnabled(kOfflinePagesCTFeature);
 }