Autofill Credit Card Signin Promo: Put behind Feature

components/autofill/core/browser/autofill_experiments.h

Index: components/autofill/core/browser/autofill_experiments.h
diff --git a/components/autofill/core/browser/autofill_experiments.h b/components/autofill/core/browser/autofill_experiments.h
index 390ed55a49d12269af859862b7e4081013fd26d5..70fc201f03719f794d2476017810aeeb7f172c47 100644
--- a/components/autofill/core/browser/autofill_experiments.h
+++ b/components/autofill/core/browser/autofill_experiments.h
@@ -20,6 +20,8 @@ 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.
@@ -34,6 +36,13 @@ 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.