Autofill Credit Card Signin Promo: Put behind Feature

components/autofill/core/browser/autofill_experiments.h

 // 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.
 
 #ifndef COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_EXPERIMENTS_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_EXPERIMENTS_H_
 
 #include <string>
 
 namespace base {
 struct Feature;
 }
 
 namespace sync_driver {
 class SyncService;
 }
 
 class PrefService;
 
 namespace autofill {
 
 extern const base::Feature kAutofillProfileCleanup;
+extern const base::Feature kAutofillCreditCardSigninPromo;
+extern const char kCreditCardSigninPromoImpressionLimitParamKey[];
 
 // Returns true if autofill should be enabled. See also
 // IsInAutofillSuggestionsDisabledExperiment below.
 bool IsAutofillEnabled(const PrefService* pref_service);
 
 // Returns true if autofill suggestions are disabled via experiment. The
 // disabled experiment isn't the same as disabling autofill completely since we
 // still want to run detection code for metrics purposes. This experiment just
 // disables providing suggestions.
 bool IsInAutofillSuggestionsDisabledExperiment();
 
 // Returns whether the Autofill profile cleanup feature is enabled.
 bool IsAutofillProfileCleanupEnabled();
 
+// Returns whether the Autofill credit card signin promo should be shown.
+bool IsAutofillCreditCardSigninPromoEnabled();
+
+// Returns the maximum number of impressions of the credit card signin promo, or
+// 0 if there are no limits.
+int GetCreditCardSigninPromoImpressionLimit();
+
 // Returns true if the user should be offered to locally store unmasked cards.
 // This controls whether the option is presented at all rather than the default
 // response of the option.
 bool OfferStoreUnmaskedCards();
 
 // Returns true if uploading credit cards to Wallet servers is enabled. This
 // requires the appropriate flags and user settings to be true and the user to
 // be a member of a supported domain.
 bool IsCreditCardUploadEnabled(const PrefService* pref_service,
                                const sync_driver::SyncService* sync_service,
                                const std::string& user_email);
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_EXPERIMENTS_H_