[Payment Request] Updates PaymentRequestEditViewController in showcase

ios/chrome/browser/ui/payments/payment_request_edit_view_controller.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/chrome/browser/ui/payments/payment_request_edit_view_controller.h"
 
 #include "base/logging.h"
 #import "base/mac/foundation_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "components/strings/grit/components_strings.h"
@@ skipping 304 matching lines @@
   item.textFieldValue = field.value;
 
   // Cache the options if there are any and set the text field's UIPickerView.
   if (options.count) {
     NSNumber* key = [NSNumber numberWithInt:field.autofillUIType];
     [self.options setObject:options forKey:key];
 
     UIPickerView* pickerView = [[UIPickerView alloc] initWithFrame:CGRectZero];
     pickerView.delegate = self;
     pickerView.dataSource = self;
+    pickerView.accessibilityIdentifier =
+        [NSString stringWithFormat:@"%@_pickerView", field.label];
     [self.pickerViews setObject:pickerView forKey:key];
     item.inputView = pickerView;
+
+    // Set UIPickerView's default selected row.
+    [pickerView reloadAllComponents];
+    [pickerView selectRow:[options indexOfObject:field.value]
+              inComponent:0
+                 animated:NO];
   }
 
   // Reload the item.
   NSIndexPath* indexPath =
       [self.collectionViewModel indexPathForItemType:ItemTypeTextField
                                    sectionIdentifier:field.sectionIdentifier];
   [self.collectionView reloadItemsAtIndexPaths:@[ indexPath ]];
 }
 
 #pragma mark - UITextFieldDelegate
@@ skipping 389 matching lines @@
   [_currentEditingCell.textField resignFirstResponder];
 
   if (![self validateForm])
     return;
 
   [self.delegate paymentRequestEditViewController:self
                            didFinishEditingFields:self.fields];
 }
 
 @end