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

components/offline_pages/offline_page_model_impl_unittest.cc

Index: components/offline_pages/offline_page_model_impl_unittest.cc
diff --git a/components/offline_pages/offline_page_model_impl_unittest.cc b/components/offline_pages/offline_page_model_impl_unittest.cc
index e9cdd58ef4e60c7f8546d48794cd626192166154..6cf5387ea06f9ec2c2a09c97d00068e717dcf5de 100644
--- a/components/offline_pages/offline_page_model_impl_unittest.cc
+++ b/components/offline_pages/offline_page_model_impl_unittest.cc
@@ -1232,4 +1232,15 @@ TEST(CommandLineFlagsTest, OfflinePagesSharing) {
   EXPECT_TRUE(offline_pages::IsOfflinePagesSharingEnabled());
 }
 
+TEST(CommandLineFlagsTest, OfflinePagesSvelteConcurrentLoading) {
+  // This feature is disabled by default.
+  EXPECT_FALSE(offline_pages::IsOfflinePagesSvelteConcurrentLoadingEnabled());
+
+  // Check if feature is correctly enabled by command-line flag.
+  base::test::ScopedFeatureList scoped_feature_list;
+  scoped_feature_list.InitAndEnableFeature(
+      kOfflinePagesSvelteConcurrentLoadingFeature);
+  EXPECT_TRUE(offline_pages::IsOfflinePagesSvelteConcurrentLoadingEnabled());
+}
+
 }  // namespace offline_pages