Add and update prefs for search engine promo

chrome/browser/android/chrome_feature_list.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/android/chrome_feature_list.h"
 
 #include <stddef.h>
 
 #include <string>
 
@@ skipping 53 matching lines @@
     &kImprovedA2HS,
     &kNewPhotoPicker,
     &kNoCreditCardAbort,
     &kNTPCondensedLayoutFeature,
     &kNTPCondensedTileLayoutFeature,
     &kNTPLaunchAfterInactivity,
     &kNTPOfflinePagesFeature,
     &NTPShowGoogleGInOmniboxFeature,
     &kPhysicalWebFeature,
     &kPhysicalWebSharing,
+    &kSearchEnginePromoExistingDevice,
+    &kSearchEnginePromoNewDevice,
     &kSpecialLocaleFeature,
     &kSpecialLocaleWrapper,
     &kTabsInCBD,
     &kTabReparenting,
     &kVideoPersistence,
     &kWebPaymentsModifiers,
     &kWebPaymentsSingleAppUiSkip,
     &kWebVRCardboardSupport,
     &ntp_snippets::kIncreasedVisibility,
     &ntp_snippets::kForeignSessionsSuggestionsFeature,
@@ skipping 194 matching lines @@
   return base::GetFieldTrialParamByFeatureAsBool(*feature, param_name,
                                                  jdefault_value);
 }
 
 bool RegisterChromeFeatureListJni(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android
 }  // namespace chrome