PaymentApp: Implement simulateInvokingPaymentApp() for LayoutTest.

content/public/browser/payment_app_provider.h

 // Copyright 2016 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_PAYMENT_APP_PROVIDER_H_
 #define CONTENT_PUBLIC_BROWSER_PAYMENT_APP_PROVIDER_H_
 
 #include <utility>
 #include <vector>
 
 #include "base/callback_forward.h"
+#include "components/payments/payment_app.mojom.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
 class BrowserContext;
 
 // This is providing the service worker based payment app related APIs to
 // Chrome layer. This class is a singleton, the instance of which can be
 // retrieved using the static GetInstance() method.
 // All methods must be called on the UI thread.
@@ skipping 18 matching lines @@
       int64_t registration_id,
       payments::mojom::PaymentAppRequestDataPtr data) = 0;
 
  protected:
   virtual ~PaymentAppProvider() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_PAYMENT_APP_PROVIDER_H_