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

ios/chrome/browser/payments/shipping_option_selection_view_controller.h

+// Copyright 2017 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_OPTION_SELECTION_VIEW_CONTROLLER_H_
+#define IOS_CHROME_BROWSER_PAYMENTS_SHIPPING_OPTION_SELECTION_VIEW_CONTROLLER_H_
+
+#import <UIKit/UIKit.h>
+
+#import "ios/chrome/browser/ui/collection_view/collection_view_controller.h"
+#include "ios/web/public/payments/payment_request.h"
+
+@class ShippingOptionSelectionViewController;
+
+@protocol ShippingOptionSelectionViewControllerDelegate<NSObject>
+
+- (void)shippingOptionSelectionViewController:
+            (ShippingOptionSelectionViewController*)controller
+                       selectedShippingOption:
+                           (web::PaymentShippingOption*)shippingOption;
+- (void)shippingOptionSelectionViewControllerDidReturn:
+    (ShippingOptionSelectionViewController*)controller;
+
+@end
+
+// View controller responsible for presenting the available shipping options
+// for selection by the user and communicating their choice to the supplied
+// delegate.
+@interface ShippingOptionSelectionViewController : CollectionViewController
+
+// The available shipping options to fulfill the payment request.
+@property(nonatomic, assign) std::vector<web::PaymentShippingOption*>
+    shippingOptions;
+
+// The shipping option selected by the user, if any.
+@property(nonatomic, assign) web::PaymentShippingOption* selectedShippingOption;
+
+// The delegate to be notified when the user selects a shipping option or
+// returns without selecting one.
+@property(nonatomic, weak) id<ShippingOptionSelectionViewControllerDelegate>
+    delegate;
+
+- (instancetype)init NS_DESIGNATED_INITIALIZER;
+
+- (instancetype)initWithStyle:(CollectionViewControllerStyle)style
+    NS_UNAVAILABLE;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_PAYMENTS_SHIPPING_OPTION_SELECTION_VIEW_CONTROLLER_H_