[Autofill] Implement Credit Card Signin Promo

components/autofill/core/browser/test_autofill_client.cc

 // Copyright 2014 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 "components/autofill/core/browser/test_autofill_client.h"
 
 #include "components/autofill/core/browser/webdata/autofill_webdata_service.h"
 
 namespace autofill {
 
@@ skipping 97 matching lines @@
     const base::string16& profile_full_name) {
 }
 
 void TestAutofillClient::OnFirstUserGestureObserved() {
 }
 
 bool TestAutofillClient::IsContextSecure(const GURL& form_origin) {
   return is_context_secure_;
 }
 
+bool TestAutofillClient::ShouldShowSigninPromo() {
+  return false;
+}
+
+void TestAutofillClient::StartSigninFlow() {}
+
 }  // namespace autofill