PaymentApp: Implement respondWith() in PaymentRequestEvent. (content side)

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 <stdint.h>
 #include <utility>
 #include <vector>
 
 #include "base/callback_forward.h"
+#include "components/payments/content/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.
 class CONTENT_EXPORT PaymentAppProvider {
  public:
   // This static function is actually implemented in PaymentAppProviderImpl.cc.
   // Please see: content/browser/payments/payment_app_provider_impl.cc
   static PaymentAppProvider* GetInstance();
 
   // The ManifestWithID is a pair of the service worker registration id and
   // the payment app manifest data associated with it.
   using ManifestWithID =
       std::pair<int64_t, payments::mojom::PaymentAppManifestPtr>;
   using Manifests = std::vector<ManifestWithID>;
+
+  // TODO(zino): Consider to use base::OnceCallback instead of base::Callback.
+  // Please see: http://crbug.com/704193
   using GetAllManifestsCallback = base::Callback<void(Manifests)>;
+  using InvokePaymentAppCallback =
+      base::Callback<void(payments::mojom::PaymentAppResponsePtr)>;
 
   // Should be accessed only on the UI thread.
   virtual void GetAllManifests(BrowserContext* browser_context,
                                const GetAllManifestsCallback& callback) = 0;
   virtual void InvokePaymentApp(
       BrowserContext* browser_context,
       int64_t registration_id,
-      payments::mojom::PaymentAppRequestPtr app_request) = 0;
+      payments::mojom::PaymentAppRequestPtr app_request,
+      const InvokePaymentAppCallback& callback) = 0;
 
  protected:
   virtual ~PaymentAppProvider() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_PAYMENT_APP_PROVIDER_H_