[Payment Request] Payment request summary view pending state

ios/chrome/browser/payments/payment_request_coordinator.mm

Index: ios/chrome/browser/payments/payment_request_coordinator.mm
diff --git a/ios/chrome/browser/payments/payment_request_coordinator.mm b/ios/chrome/browser/payments/payment_request_coordinator.mm
index b6fde1d773f8c280e1191c3a479758da40e16d09..326060d688582840a5ff2e18b4728b32bee7100d 100644
--- a/ios/chrome/browser/payments/payment_request_coordinator.mm
+++ b/ios/chrome/browser/payments/payment_request_coordinator.mm
@@ -204,6 +204,11 @@ class FullCardRequester
     }
   }
 
+  _viewController.view.userInteractionEnabled = NO;
+  [_viewController setPending:YES];
+  [_viewController loadModel];
+  [[_viewController collectionView] reloadData];
+
   [_delegate paymentRequestCoordinator:self
          didConfirmWithPaymentResponse:paymentResponse];
 }