PaymentApp: Implement PaymentAppProvider for LayoutTest.

content/shell/browser/layout_test/layout_test_payment_app_provider_impl.h

+// 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.
+
+#ifndef CONTENT_SHELL_BROWSER_LAYOUT_TEST_LAYOUT_TEST_PAYMENT_APP_PROVIDER_IMPL_H_
+#define CONTENT_SHELL_BROWSER_LAYOUT_TEST_LAYOUT_TEST_PAYMENT_APP_PROVIDER_IMPL_H_
+
+#include "base/macros.h"
+#include "content/shell/common/layout_test/layout_test_payment_app_provider.mojom.h"
+
+namespace content {
+
+class LayoutTestPaymentAppProviderImpl
+    : public mojom::LayoutTestPaymentAppProvider {
+ public:
+  LayoutTestPaymentAppProviderImpl();
+  ~LayoutTestPaymentAppProviderImpl() override;
+
+  static void Create(mojom::LayoutTestPaymentAppProviderRequest request);
+
+ private:
+  // Implmenetation of LayoutTestPaymentAppProvider
+  void GetAllPaymentAppIDs(
+      const GetAllPaymentAppIDsCallback& callback) override;
+  void InvokePaymentApp(int64_t registration_id) override;
+
+  DISALLOW_COPY_AND_ASSIGN(LayoutTestPaymentAppProviderImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_SHELL_BROWSER_LAYOUT_TEST_LAYOUT_TEST_PAYMENT_APP_PROVIDER_IMPL_H_