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

components/payments/content/payment_request_web_contents_manager.cc

Index: components/payments/content/payment_request_web_contents_manager.cc
diff --git a/components/payments/content/payment_request_web_contents_manager.cc b/components/payments/content/payment_request_web_contents_manager.cc
index db68134c47cf82d4ffb92e54f75601718e7a2b9f..a0f95da92e3f13e7031b661234b6bb7f3b3b7442 100644
--- a/components/payments/content/payment_request_web_contents_manager.cc
+++ b/components/payments/content/payment_request_web_contents_manager.cc
@@ -30,9 +30,11 @@ PaymentRequestWebContentsManager::GetOrCreateForWebContents(
 void PaymentRequestWebContentsManager::CreatePaymentRequest(
     content::WebContents* web_contents,
     std::unique_ptr<PaymentRequestDelegate> delegate,
-    mojo::InterfaceRequest<payments::mojom::PaymentRequest> request) {
+    mojo::InterfaceRequest<payments::mojom::PaymentRequest> request,
+    PaymentRequest::ObserverForTest* observer_for_testing) {
   auto new_request = base::MakeUnique<PaymentRequest>(
-      web_contents, std::move(delegate), this, std::move(request));
+      web_contents, std::move(delegate), this, std::move(request),
+      observer_for_testing);
   PaymentRequest* request_ptr = new_request.get();
   payment_requests_.insert(std::make_pair(request_ptr, std::move(new_request)));
 }