Autofill Credit Card Signin Promo: Put behind Feature

components/autofill/core/common/autofill_pref_names.cc

Index: components/autofill/core/common/autofill_pref_names.cc
diff --git a/components/autofill/core/common/autofill_pref_names.cc b/components/autofill/core/common/autofill_pref_names.cc
index 526b93a063f0f8fe3816f4aca3acaf86b4ec59cd..1dc5b59116d2c2175491b9861c3badb749cd90d1 100644
--- a/components/autofill/core/common/autofill_pref_names.cc
+++ b/components/autofill/core/common/autofill_pref_names.cc
@@ -7,6 +7,10 @@
 namespace autofill {
 namespace prefs {
 
+// Number of times the credit card signin promo has been shown.
+const char kAutofillCreditCardSigninPromoImpressionCount[] =
+    "autofill.credit_card_signin_promo_impression_count";
+
 // Boolean that is true if Autofill is enabled and allowed to save profile data.
 const char kAutofillEnabled[] = "autofill.enabled";