[Payment Request] Payment request summary view pending state

ios/chrome/browser/payments/shipping_option_selection_coordinator.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.
 
 #import "ios/chrome/browser/payments/shipping_option_selection_coordinator.h"
 
 #include "base/strings/sys_string_conversions.h"
 #import "ios/chrome/browser/payments/payment_request_util.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
@@ skipping 35 matching lines @@
 - (void)stop {
   [self.baseViewController.navigationController popViewControllerAnimated:YES];
   _viewController = nil;
 }
 
 - (void)stopSpinnerAndDisplayError {
   // Re-enable user interactions that were disabled earlier in
   // delayedNotifyDelegateOfSelection.
   _viewController.view.userInteractionEnabled = YES;
 
-  [_viewController setIsLoading:NO];
-  NSString* errorMessage =
-      payment_request_util::GetShippingOptionSelectorErrorMessage(
-          _paymentRequest);
-  [_viewController setErrorMessage:errorMessage];
+  [_viewController setPending:NO];
+  [_viewController setErrorMessage:payment_request_util::
+                                       GetShippingOptionSelectorErrorMessage(
+                                           _paymentRequest)];
   [_viewController loadModel];
   [[_viewController collectionView] reloadData];
 }
 
 #pragma mark - ShippingOptionSelectionViewControllerDelegate
 
 - (void)shippingOptionSelectionViewController:
             (ShippingOptionSelectionViewController*)controller
                       didSelectShippingOption:
                           (web::PaymentShippingOption*)shippingOption {
   [self delayedNotifyDelegateOfSelection:shippingOption];
 }
 
 - (void)shippingOptionSelectionViewControllerDidReturn:
     (ShippingOptionSelectionViewController*)controller {
   [_delegate shippingOptionSelectionCoordinatorDidReturn:self];
 }
 
 - (void)delayedNotifyDelegateOfSelection:
     (web::PaymentShippingOption*)shippingOption {
   _viewController.view.userInteractionEnabled = NO;
   __weak ShippingOptionSelectionCoordinator* weakSelf = self;
   dispatch_after(dispatch_time(DISPATCH_TIME_NOW,
                                static_cast<int64_t>(0.2 * NSEC_PER_SEC)),
                  dispatch_get_main_queue(), ^{
                    ShippingOptionSelectionCoordinator* strongSelf = weakSelf;
-                   [strongSelf.viewController setIsLoading:YES];
+                   // Early return if the coordinator has been deallocated.
+                   if (!strongSelf)
+                     return;
+                   [strongSelf.viewController setPending:YES];
                    [strongSelf.viewController loadModel];
                    [[strongSelf.viewController collectionView] reloadData];
 
                    [strongSelf.delegate
                        shippingOptionSelectionCoordinator:strongSelf
                                   didSelectShippingOption:shippingOption];
                  });
 }
 
 @end