Restored an option to enable enhanced bookmarks experiment from Finch

chrome/browser/bookmarks/enhanced_bookmarks_features.h

Index: chrome/browser/bookmarks/enhanced_bookmarks_features.h
diff --git a/chrome/browser/bookmarks/enhanced_bookmarks_features.h b/chrome/browser/bookmarks/enhanced_bookmarks_features.h
index c3bf9591dc17834bc481ccc26d2ad621cd0a0dee..8bd523cf7530434ad9f46ed52eaef13a0f1da697 100644
--- a/chrome/browser/bookmarks/enhanced_bookmarks_features.h
+++ b/chrome/browser/bookmarks/enhanced_bookmarks_features.h
@@ -14,7 +14,10 @@ class PrefService;
 enum BookmarksExperimentState {
   kNoBookmarksExperiment,
   kBookmarksExperimentEnabled,
-  kBookmarksExperimentEnabledUserOptOut
+  kBookmarksExperimentEnabledUserOptOut,
+  kBookmarksExperimentEnabledFromFinch,
+  kBookmarksExperimentOptoutFromFinch,
+  kBookmarksExperimentEnumSize
 };
 
 // Sets flag to opt-in user into Finch experiment.
@@ -25,6 +28,9 @@ void UpdateBookmarksExperiment(
 // Returns true if enhanced bookmarks experiment is enabled.
 bool IsEnhancedBookmarksExperimentEnabled();
 
+// Returns true if enhanced bookmarks experiment is enabled from Finch.
+bool IsEnhancedBookmarksExperimentEnabledFromFinch();
+
 // Returns true when flag enable-dom-distiller is set or enabled from Finch.
 bool IsEnableDomDistillerSet();