Upstream Chrome on iOS source code [2/11].

ios/chrome/browser/payments/payment_method_selection_coordinator.mm

+// 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.
+
+#import "ios/chrome/browser/payments/payment_method_selection_coordinator.h"
+
+#import "base/ios/weak_nsobject.h"
+#include "base/mac/scoped_nsobject.h"
+#include "components/autofill/core/browser/credit_card.h"
+
+@interface PaymentMethodSelectionCoordinator () {
+  base::WeakNSProtocol<id<PaymentMethodSelectionCoordinatorDelegate>> _delegate;
+  base::scoped_nsobject<PaymentMethodSelectionViewController> _viewController;
+}
+
+@end
+
+@implementation PaymentMethodSelectionCoordinator
+
+@synthesize paymentMethods = _paymentMethods;
+@synthesize selectedPaymentMethod = _selectedPaymentMethod;
+
+- (id<PaymentMethodSelectionCoordinatorDelegate>)delegate {
+  return _delegate.get();
+}
+
+- (void)setDelegate:(id<PaymentMethodSelectionCoordinatorDelegate>)delegate {
+  _delegate.reset(delegate);
+}
+
+- (void)start {
+  _viewController.reset([[PaymentMethodSelectionViewController alloc] init]);
+  [_viewController setPaymentMethods:_paymentMethods];
+  [_viewController setSelectedPaymentMethod:_selectedPaymentMethod];
+  [_viewController setDelegate:self];
+  [_viewController loadModel];
+
+  DCHECK([self baseViewController].navigationController);
+  [[self baseViewController].navigationController
+      pushViewController:_viewController
+                animated:YES];
+}
+
+- (void)stop {
+  [[self baseViewController].navigationController
+      popViewControllerAnimated:YES];
+  _viewController.reset();
+}
+
+#pragma mark - PaymentMethodSelectionViewControllerDelegate
+
+- (void)paymentMethodSelectionViewController:
+            (PaymentMethodSelectionViewController*)controller
+                       selectedPaymentMethod:
+                           (autofill::CreditCard*)paymentMethod {
+  _selectedPaymentMethod = paymentMethod;
+  [_delegate paymentMethodSelectionCoordinator:self
+                         selectedPaymentMethod:paymentMethod];
+}
+
+- (void)paymentMethodSelectionViewControllerDidReturn:
+    (PaymentMethodSelectionViewController*)controller {
+  [_delegate paymentMethodSelectionCoordinatorDidReturn:self];
+}
+
+@end