Get signals working in the EXTRA_DATA section of MHTML

components/offline_pages/core/offline_page_model_impl_unittest.cc

Index: components/offline_pages/core/offline_page_model_impl_unittest.cc
diff --git a/components/offline_pages/core/offline_page_model_impl_unittest.cc b/components/offline_pages/core/offline_page_model_impl_unittest.cc
index b5806b222b7a343c8cf21ba5e3c43916eff73ef0..8d20e475263a86edf80249c8ab02fc702a2893f6 100644
--- a/components/offline_pages/core/offline_page_model_impl_unittest.cc
+++ b/components/offline_pages/core/offline_page_model_impl_unittest.cc
@@ -1347,4 +1347,15 @@ TEST(CommandLineFlagsTest, OfflinePagesSvelteConcurrentLoading) {
   EXPECT_TRUE(offline_pages::IsOfflinePagesSvelteConcurrentLoadingEnabled());
 }
 
+TEST(CommandLineFlagsTest, OfflinePagesLoadSignalCollecting) {
+  // This feature is disabled by default.
+  EXPECT_FALSE(offline_pages::IsOfflinePagesLoadSignalCollectingEnabled());
+
+  // Check if feature is correctly enabled by command-line flag.
+  base::test::ScopedFeatureList scoped_feature_list;
+  scoped_feature_list.InitAndEnableFeature(
+      kOfflinePagesLoadSignalCollectingFeature);
+  EXPECT_TRUE(offline_pages::IsOfflinePagesLoadSignalCollectingEnabled());
+}
+
 }  // namespace offline_pages