[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 041574c69deee400a359edfae62d0be2952d0cbb..4c535c4d0651ed012b6e26f5b66f8d82787ecbf5 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 setIsPending:YES];
+  [_viewController loadModel];
+  [[_viewController collectionView] reloadData];
+
   [_delegate paymentRequestCoordinator:self
          didConfirmWithPaymentResponse:paymentResponse];
 }