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

ios/chrome/browser/payments/payment_method_selection_coordinator.h

 // 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.
 
 #ifndef IOS_CHROME_BROWSER_PAYMENTS_PAYMENT_METHOD_SELECTION_COORDINATOR_H_
 #define IOS_CHROME_BROWSER_PAYMENTS_PAYMENT_METHOD_SELECTION_COORDINATOR_H_
 
 #import <UIKit/UIKit.h>
 #include <vector>
 
 #import "ios/chrome/browser/chrome_coordinator.h"
 #import "ios/chrome/browser/payments/payment_method_selection_view_controller.h"
 
 namespace autofill {
 class CreditCard;
 }
 
 @class PaymentMethodSelectionCoordinator;
 
 @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;
 
 @end
 
 // Coordinator responsible for creating and presenting the payment method
 // selection view controller. This view controller will be presented by the view
 // controller provided in the initializer.
 @interface PaymentMethodSelectionCoordinator
     : ChromeCoordinator<PaymentMethodSelectionViewControllerDelegate>
 
 // The payment methods available to fulfill the payment request.
 @property(nonatomic, assign) std::vector<autofill::CreditCard*> paymentMethods;
 
 // The payment method selected by the user, if any.
 @property(nonatomic, assign) autofill::CreditCard* selectedPaymentMethod;
 
 // The delegate to be notified when the user selects a payment method or returns
 // without selecting a payment method.
 @property(nonatomic, weak) id<PaymentMethodSelectionCoordinatorDelegate>
     delegate;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_PAYMENTS_PAYMENT_METHOD_SELECTION_COORDINATOR_H_