[Payments] PR: Basic test for the order summary section.

chrome/browser/ui/views/payments/payment_request_dialog_view.cc

Index: chrome/browser/ui/views/payments/payment_request_dialog_view.cc
diff --git a/chrome/browser/ui/views/payments/payment_request_dialog_view.cc b/chrome/browser/ui/views/payments/payment_request_dialog_view.cc
index 8abd3608c5b96b60958eabbb573674f4a41255e9..e9ca82b993bfa56e5964b4e2083572aebc6f3115 100644
--- a/chrome/browser/ui/views/payments/payment_request_dialog_view.cc
+++ b/chrome/browser/ui/views/payments/payment_request_dialog_view.cc
@@ -102,6 +102,9 @@ void PaymentRequestDialogView::ShowOrderSummary() {
   view_stack_.Push(CreateViewAndInstallController<OrderSummaryViewController>(
                        &controller_map_, request_, this),
                    /* animate = */ true);
+
+  if (observer_for_testing_)
+    observer_for_testing_->OnOrderSummaryOpened();
 }
 
 void PaymentRequestDialogView::ShowPaymentMethodSheet() {