[Payment Request] Picker view + showcase integration + egtests

ios/showcase/payments/sc_payments_picker_coordinator.mm

+// 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.
+
+#import "ios/showcase/payments/sc_payments_picker_coordinator.h"
+
+#import "ios/chrome/browser/payments/payment_request_picker_row.h"
+#import "ios/chrome/browser/payments/payment_request_picker_view_controller.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@interface SCPaymentsPickerCoordinator ()<
+    PaymentRequestPickerViewControllerDelegate>
+
+@property(nonatomic, strong)
+    PaymentRequestPickerViewController* pickerViewController;
+
+@end
+
+@implementation SCPaymentsPickerCoordinator
+
+@synthesize baseViewController = _baseViewController;
+@synthesize pickerViewController = _pickerViewController;
+
+- (void)start {
+  NSArray<PickerRow*>* rows = [self rows];
+  _pickerViewController = [[PaymentRequestPickerViewController alloc]
+      initWithRows:rows
+          selected:rows[rows.count - 1]];
+  [_pickerViewController setTitle:@"Select a country"];
+  [_pickerViewController setDelegate:self];
+  [self.baseViewController pushViewController:_pickerViewController
+                                     animated:YES];
+}
+
+#pragma mark - PaymentRequestPickerViewControllerDelegate
+
+- (void)paymentRequestPickerViewController:
+            (PaymentRequestPickerViewController*)controller
+                              didSelectRow:(PickerRow*)row {

[lpromero, 2017/03/29 11:38:15]

You can use the ProtocolAlerter to trigger an alert. That way you can add a test
that checks this is called.

[Moe, 2017/03/29 17:04:09]

Done.

+}
+
+#pragma mark - Helper methods
+
+- (NSArray<PickerRow*>*)rows {
+  return @[
+    [[PickerRow alloc] initWithLabel:@"Chile" value:@"CHL"],
+    [[PickerRow alloc] initWithLabel:@"Canada" value:@"CAN"],
+    [[PickerRow alloc] initWithLabel:@"Belgium" value:@"BEL"],
+    [[PickerRow alloc] initWithLabel:@"España" value:@"ESP"],
+    [[PickerRow alloc] initWithLabel:@"México" value:@"MEX"],
+    [[PickerRow alloc] initWithLabel:@"Brazil" value:@"BRA"],
+    [[PickerRow alloc] initWithLabel:@"China" value:@"CHN"]
+  ];
+}
+
+@end