[chrome://flags] Let features override params in the same trial

components/flags_ui/flags_state.h

Index: components/flags_ui/flags_state.h
diff --git a/components/flags_ui/flags_state.h b/components/flags_ui/flags_state.h
index 17b3b99c5320c2f56232b3130983c3db7cbd55aa..4eff17b91a2136e40b15433da5435d97ef876363 100644
--- a/components/flags_ui/flags_state.h
+++ b/components/flags_ui/flags_state.h
@@ -27,7 +27,10 @@ namespace flags_ui {
 namespace internal {
 // The trial group selected when feature variation parameters are registered via
 // FlagsState::RegisterFeatureVariationParameters().
-extern const char kTrialGroupAboutFlags[];
+extern const char kDefaultGroupNameAboutFlags[];
+// The trial name used when feature variation parameters are registered for a
+// FEATURE_WITH_VARIATIONS_VALUE_TYPE_WITH_DEFAULT_TRIAL FeatureEntry.
+extern const char kDefaultTrialNameAboutFlags[];
 }  // namespace internal
 
 struct FeatureEntry;