[Payments] Have an observer for canMakePayment, for testing.

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

Index: chrome/browser/ui/views/payments/payment_request_browsertest_base.cc
diff --git a/chrome/browser/ui/views/payments/payment_request_browsertest_base.cc b/chrome/browser/ui/views/payments/payment_request_browsertest_base.cc
index 1ca549b221a8385d73ff644d72f9f74662d9978a..f9f50d56483d7a45b636685958d6b88cbc9f74a9 100644
--- a/chrome/browser/ui/views/payments/payment_request_browsertest_base.cc
+++ b/chrome/browser/ui/views/payments/payment_request_browsertest_base.cc
@@ -91,6 +91,11 @@ void PaymentRequestBrowserTestBase::SetIncognitoForTesting() {
   incognito_for_testing_ = true;
 }
 
+void PaymentRequestBrowserTestBase::OnCanMakePaymentCalled() {
+  if (event_observer_)
+    event_observer_->Observe(DialogEvent::CAN_MAKE_PAYMENT_CALLED);
+}
+
 void PaymentRequestBrowserTestBase::OnDialogOpened() {
   if (event_observer_)
     event_observer_->Observe(DialogEvent::DIALOG_OPENED);
@@ -272,7 +277,7 @@ void PaymentRequestBrowserTestBase::CreatePaymentRequestForTest(
   delegate_ = delegate.get();
   PaymentRequestWebContentsManager::GetOrCreateForWebContents(web_contents)
       ->CreatePaymentRequest(web_contents, std::move(delegate),
-                             std::move(request));
+                             std::move(request), this);
 }
 
 void PaymentRequestBrowserTestBase::ClickOnDialogViewAndWait(