[Payment Request] Displays appropriate footer if first transaction completed

ios/chrome/browser/payments/payment_request.mm

 // 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 "ios/chrome/browser/payments/payment_request.h"
 
 #include <algorithm>
 
 #include "base/containers/adapters.h"
 #include "base/memory/ptr_util.h"
 #include "base/stl_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/autofill/core/browser/autofill_data_util.h"
 #include "components/autofill/core/browser/autofill_profile.h"
 #include "components/autofill/core/browser/personal_data_manager.h"
 #include "components/autofill/core/browser/region_data_loader_impl.h"
 #include "components/autofill/core/browser/validation.h"
 #include "components/payments/core/address_normalizer_impl.h"
 #include "components/payments/core/currency_formatter.h"
 #include "components/payments/core/payment_request_data_util.h"
+#include "components/prefs/pref_service.h"
+#include "components/signin/core/browser/signin_manager.h"
 #include "ios/chrome/browser/application_context.h"
 #include "ios/chrome/browser/autofill/validation_rules_storage_factory.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #import "ios/chrome/browser/payments/payment_request_util.h"
+#include "ios/chrome/browser/signin/signin_manager_factory.h"
 #include "ios/web/public/payments/payment_request.h"
 #include "third_party/libaddressinput/chromium/chrome_metadata_source.h"
 #include "third_party/libaddressinput/src/cpp/include/libaddressinput/source.h"
 #include "third_party/libaddressinput/src/cpp/include/libaddressinput/storage.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 namespace {
@@ skipping 114 matching lines @@
           .release(),
       GetAddressInputStorage().release(),
       GetApplicationContext()->GetApplicationLocale());
 }
 
 ukm::UkmRecorder* PaymentRequest::GetUkmRecorder() {
   return GetApplicationContext()->GetUkmRecorder();
 }
 
 std::string PaymentRequest::GetAuthenticatedEmail() const {
-  NOTREACHED() << "Implementation is never used";
-  return std::string();
+  const SigninManager* signin_manager =
+      ios::SigninManagerFactory::GetForBrowserStateIfExists(browser_state_);
+  if (signin_manager && signin_manager->IsAuthenticated())
+    return signin_manager->GetAuthenticatedAccountInfo().email;
+  else
+    return std::string();
 }
 
 PrefService* PaymentRequest::GetPrefService() {
-  NOTREACHED() << "Implementation is never used";
-  return nullptr;
+  return browser_state_->GetPrefs();
 }
 
 void PaymentRequest::UpdatePaymentDetails(const web::PaymentDetails& details) {
   web_payment_request_.details = details;
   PopulateAvailableShippingOptions();
   SetSelectedShippingOption();
 }
 
 bool PaymentRequest::request_shipping() const {
   return web_payment_request_.options.request_shipping;
@@ skipping 186 matching lines @@
 void PaymentRequest::SetSelectedShippingOption() {
   // If more than one option has |selected| set, the last one in the sequence
   // should be treated as the selected item.
   for (auto* shipping_option : base::Reversed(shipping_options_)) {
     if (shipping_option->selected) {
       selected_shipping_option_ = shipping_option;
       break;
     }
   }
 }