[NTP Snippets] Make a base::Feature instead of raw cmdline flag

chrome/browser/android/chrome_feature_list.cc

Index: chrome/browser/android/chrome_feature_list.cc
diff --git a/chrome/browser/android/chrome_feature_list.cc b/chrome/browser/android/chrome_feature_list.cc
index 8b44469b7a37e05546fa58c7666eef0a6fce1ec9..eeefab196f5a4531b9c55aea6dda501d93b40f51 100644
--- a/chrome/browser/android/chrome_feature_list.cc
+++ b/chrome/browser/android/chrome_feature_list.cc
@@ -25,6 +25,7 @@ namespace {
 // other locations in the code base (e.g. chrome/, components/, etc).
 const base::Feature* kFeaturesExposedToJava[] = {
     &kNTPOfflinePagesFeature,
+    &kNTPSnippetsFeature,
     &kPhysicalWebFeature,
 };
 
@@ -34,6 +35,10 @@ const base::Feature kNTPOfflinePagesFeature {
   "NTPOfflinePages", base::FEATURE_DISABLED_BY_DEFAULT
 };
 
+const base::Feature kNTPSnippetsFeature {
+  "NTPSnippets", base::FEATURE_DISABLED_BY_DEFAULT
+};
+
 const base::Feature kPhysicalWebFeature {
   "PhysicalWeb", base::FEATURE_DISABLED_BY_DEFAULT
 };