[Payment Request] Updates PaymentRequestEditViewController in showcase

ios/chrome/browser/ui/payments/payment_request_edit_view_controller.mm

Index: ios/chrome/browser/ui/payments/payment_request_edit_view_controller.mm
diff --git a/ios/chrome/browser/ui/payments/payment_request_edit_view_controller.mm b/ios/chrome/browser/ui/payments/payment_request_edit_view_controller.mm
index 9539bc97e6458619955669b8c18347ebaf21d677..523bdb16cbe642f7ce72b56c4ba3844043cd69f0 100644
--- a/ios/chrome/browser/ui/payments/payment_request_edit_view_controller.mm
+++ b/ios/chrome/browser/ui/payments/payment_request_edit_view_controller.mm
@@ -322,8 +322,16 @@ typedef NS_ENUM(NSInteger, ItemType) {
     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.