[Payment Request] Payment request summary view pending state

ios/chrome/browser/payments/payment_request_coordinator.mm

 // Copyright 2016 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.
 
 #import "ios/chrome/browser/payments/payment_request_coordinator.h"
 
 #include <unordered_set>
 #include <vector>
 
 #include "base/memory/ptr_util.h"
@@ skipping 186 matching lines @@
   if (!card.billing_address_id().empty()) {
     autofill::AutofillProfile* address =
         autofill::PersonalDataManager::GetProfileFromProfilesByGUID(
             card.billing_address_id(), _paymentRequest->billing_profiles());
     if (address) {
       paymentResponse.details.billing_address =
           payment_request_util::PaymentAddressFromAutofillProfile(address);
     }
   }
 
+  _viewController.view.userInteractionEnabled = NO;
+  [_viewController setPending:YES];
+  [_viewController loadModel];
+  [[_viewController collectionView] reloadData];
+
   [_delegate paymentRequestCoordinator:self
          didConfirmWithPaymentResponse:paymentResponse];
 }
 
 - (void)updatePaymentDetails:(web::PaymentDetails)paymentDetails {
   BOOL totalValueChanged =
       (_paymentRequest->payment_details().total != paymentDetails.total);
   _paymentRequest->set_payment_details(paymentDetails);
 
   if (_paymentRequest->shipping_options().empty()) {
@@ skipping 164 matching lines @@
 - (void)paymentMethodSelectionCoordinatorDidReturn:
     (PaymentMethodSelectionCoordinator*)coordinator {
   // Clear the 'Updated' label on the payment summary item, if there is one.
   [_viewController updatePaymentSummaryWithTotalValueChanged:NO];
 
   [_methodSelectionCoordinator stop];
   _methodSelectionCoordinator = nil;
 }
 
 @end