Selected shipping option in payment summary view + shipping option selection view

ios/chrome/browser/payments/payment_method_selection_coordinator.h

Index: ios/chrome/browser/payments/payment_method_selection_coordinator.h
diff --git a/ios/chrome/browser/payments/payment_method_selection_coordinator.h b/ios/chrome/browser/payments/payment_method_selection_coordinator.h
index 36562561debc5334dd98dde7f5f878d831627733..d526e401fb57612cade330ec2e5dc885e4851be1 100644
--- a/ios/chrome/browser/payments/payment_method_selection_coordinator.h
+++ b/ios/chrome/browser/payments/payment_method_selection_coordinator.h
@@ -19,9 +19,13 @@ class CreditCard;
 
 @protocol PaymentMethodSelectionCoordinatorDelegate<NSObject>
 
+// Notifies the delegate that the user has selected a payment method.
 - (void)paymentMethodSelectionCoordinator:
             (PaymentMethodSelectionCoordinator*)coordinator
                     selectedPaymentMethod:(autofill::CreditCard*)paymentMethod;
+
+// Notifies the delegate that the user has chosen to return to the previous
+// screen without making a selection.
 - (void)paymentMethodSelectionCoordinatorDidReturn:
     (PaymentMethodSelectionCoordinator*)coordinator;