[Autofill] Implement Credit Card Signin Promo

components/autofill/core/browser/autofill_external_delegate.h

Index: components/autofill/core/browser/autofill_external_delegate.h
diff --git a/components/autofill/core/browser/autofill_external_delegate.h b/components/autofill/core/browser/autofill_external_delegate.h
index f880c750d6c56f5f846db62609edd5210f40464d..93fcdbe7f2f4a3f712aa1316636f851253ccaa82 100644
--- a/components/autofill/core/browser/autofill_external_delegate.h
+++ b/components/autofill/core/browser/autofill_external_delegate.h
@@ -142,6 +142,9 @@ class AutofillExternalDelegate : public AutofillPopupDelegate {
   // FIXME
   bool should_show_scan_credit_card_;
 
+  // Whether the credit card sign-in promo should be shown to the user.
+  bool should_show_cc_signin_promo_;
+
   // Whether the access Address Book prompt has ever been shown for the current
   // |query_form_|. This variable is only used on OSX.
   bool has_shown_address_book_prompt;