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

ios/chrome/browser/payments/shipping_address_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_SHIPPING_ADDRESS_SELECTION_COORDINATOR_H_
 #define IOS_CHROME_BROWSER_PAYMENTS_SHIPPING_ADDRESS_SELECTION_COORDINATOR_H_
 
 #import <UIKit/UIKit.h>
 #include <vector>
 
 #import "ios/chrome/browser/chrome_coordinator.h"
 
 namespace autofill {
 class AutofillProfile;
 }  // namespace autofill
 
 @class ShippingAddressSelectionCoordinator;
 
 @protocol ShippingAddressSelectionCoordinatorDelegate<NSObject>
 
+// Notifies the delegate that the user has selected a shipping address.
 - (void)shippingAddressSelectionCoordinator:
             (ShippingAddressSelectionCoordinator*)coordinator
                     selectedShippingAddress:
                         (autofill::AutofillProfile*)shippingAddress;
+
+// Notifies the delegate that the user has chosen to return to the previous
+// screen without making a selection.
 - (void)shippingAddressSelectionCoordinatorDidReturn:
     (ShippingAddressSelectionCoordinator*)coordinator;
 
 @end
 
 // Coordinator responsible for creating and presenting the shipping address
 // selection view controller. This view controller will be presented by the view
 // controller provided in the initializer.
 @interface ShippingAddressSelectionCoordinator : ChromeCoordinator
 
 // The available shipping addresses to fulfill the payment request.
 @property(nonatomic, assign) std::vector<autofill::AutofillProfile*>
     shippingAddresses;
 
 // The shipping address selected by the user, if any.
 @property(nonatomic, assign) autofill::AutofillProfile* selectedShippingAddress;
 
 // The delegate to be notified when the user selects a shipping address or
 // returns without selecting one.
 @property(nonatomic, weak) id<ShippingAddressSelectionCoordinatorDelegate>
     delegate;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_PAYMENTS_SHIPPING_ADDRESS_SELECTION_COORDINATOR_H_