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

chrome/browser/flag_descriptions.h

Index: chrome/browser/flag_descriptions.h
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 357a6959e3200c619f32c11abef3111e72230f68..bb2c06b7ba804dcbbbbb083bd57a7462630a6e97 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -2481,6 +2481,14 @@ extern const char kEnableNtpSnippetsVisibilityName[];
 // tabs on the New Tab page.
 extern const char kEnableNtpSnippetsVisibilityDescription[];
 
+// Name for the flag to enable new favicon server for content suggestions on the
+// New Tab Page.
+extern const char kEnableContentSuggestionsNewFaviconServerName[];
+
+// Description for the flag to enable new favicon server for content suggestions
+// on the New Tab Page.
+extern const char kEnableContentSuggestionsNewFaviconServerDescription[];
+
 // Name for the flag to enable server-side suggestions on the New Tab Page.
 extern const char kEnableNtpRemoteSuggestionsName[];