[Web Payments] Add data attribution string to dialog

components/payments/core/test_payment_request_delegate.cc

 // Copyright 2017 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/payments/core/test_payment_request_delegate.h"
 
 #include "base/strings/utf_string_conversions.h"
 
 namespace payments {
 
@@ skipping 59 matching lines @@
 void TestPaymentRequestDelegate::DelayFullCardRequestCompletion() {
   instantaneous_full_card_request_result_ = false;
 }
 
 void TestPaymentRequestDelegate::CompleteFullCardRequest() {
   DCHECK(instantaneous_full_card_request_result_ == false);
   full_card_result_delegate_->OnFullCardRequestSucceeded(
       full_card_request_card_, base::ASCIIToUTF16("123"));
 }
 
+std::string TestPaymentRequestDelegate::GetAuthenticatedEmail() const {
+  return "";
+}
+
+PrefService* TestPaymentRequestDelegate::GetPrefService() {
+  return nullptr;
+}
+
 }  // namespace payments