Registering field trial for a feature overridden in chrome://flags.

chrome/browser/about_flags.h

Index: chrome/browser/about_flags.h
diff --git a/chrome/browser/about_flags.h b/chrome/browser/about_flags.h
index 91917421262c8a5540eed7331aeeca32dd94bc80..b9907b8ce62cd89aede8510af6608da585afdc81 100644
--- a/chrome/browser/about_flags.h
+++ b/chrome/browser/about_flags.h
@@ -19,6 +19,7 @@
 #include "components/flags_ui/flags_state.h"
 
 namespace base {
+class FeatureList;
 class ListValue;
 }
 
@@ -34,10 +35,13 @@ void ConvertFlagsToSwitches(flags_ui::FlagsStorage* flags_storage,
                             base::CommandLine* command_line,
                             flags_ui::SentinelsMode sentinels);
 
-// Registers variations parameter values stored in |flags_storage| (previously
-// selected in about:flags).
+// Registers variations parameter values selected for features in about:flags.
+// The selected flags are retrieved from |flags_storage|, the registered
+// variation parameters are connected to their corresponding features in
+// |feature_list|.
 void RegisterAllFeatureVariationParameters(
-    flags_ui::FlagsStorage* flags_storage);
+    flags_ui::FlagsStorage* flags_storage,
+    base::FeatureList* feature_list);
 
 // Compares a set of switches of the two provided command line objects and
 // returns true if they are the same and false otherwise.