[Content suggestions] Add a feature to fetch favicons from a new server

components/ntp_snippets/features.h

Index: components/ntp_snippets/features.h
diff --git a/components/ntp_snippets/features.h b/components/ntp_snippets/features.h
index ff8abca7287b714b3c14c63384d22f1ffbcc9c68..560bd9780ffe7b157d85cac0135fbf1a559a0b49 100644
--- a/components/ntp_snippets/features.h
+++ b/components/ntp_snippets/features.h
@@ -42,6 +42,9 @@ extern const base::Feature kPreferAmpUrlsFeature;
 // Feature to choose a category ranker.
 extern const base::Feature kCategoryRanker;
 
+// Feature to allow the new Google favicon server for fetching publisher icons.
+extern const base::Feature kPublisherFaviconsFromNewServerFeature;
+
 // Parameter and its values for the kCategoryRanker feature flag.
 extern const char kCategoryRankerParameter[];
 extern const char kCategoryRankerConstantRanker[];