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

components/payments/content/payment_request_web_contents_manager.cc

 // 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.
 
 #include "components/payments/content/payment_request_web_contents_manager.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ skipping 12 matching lines @@
     content::WebContents* web_contents) {
   DCHECK(web_contents);
   // CreateForWebContents does nothing if the manager instance already exists.
   PaymentRequestWebContentsManager::CreateForWebContents(web_contents);
   return PaymentRequestWebContentsManager::FromWebContents(web_contents);
 }
 
 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)));
 }
 
 void PaymentRequestWebContentsManager::DestroyRequest(PaymentRequest* request) {
   payment_requests_.erase(request);
 }
 
 PaymentRequestWebContentsManager::PaymentRequestWebContentsManager(
     content::WebContents* web_contents) {}
 
 }  // namespace payments