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

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 8fed82549c57f7f4de2dca44846afe7b53ab8de1..28d537d7c1ba3d08ee4cc1dae66f3889ba67df1f 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -1988,6 +1988,11 @@ const FeatureEntry kFeatureEntries[] = {
      flag_descriptions::kEnableNtpSnippetsVisibilityName,
      flag_descriptions::kEnableNtpSnippetsVisibilityDescription, kOsAndroid,
      FEATURE_VALUE_TYPE(ntp_snippets::kIncreasedVisibility)},
+    {"enable-content-suggestions-new-favicon-server",
+     flag_descriptions::kEnableContentSuggestionsNewFaviconServerName,
+     flag_descriptions::kEnableContentSuggestionsNewFaviconServerDescription,
+     kOsAndroid,
+     FEATURE_VALUE_TYPE(ntp_snippets::kPublisherFaviconsFromNewServerFeature)},
     {"enable-ntp-save-to-offline",
      flag_descriptions::kEnableNtpSaveToOfflineName,
      flag_descriptions::kEnableNtpSaveToOfflineDescription, kOsAndroid,