PaymentHandler: Implement requestPermission().

chrome/browser/payments/payment_handler_permission_context.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 CHROME_BROWSER_PAYMENTS_PAYMENT_HANDLER_PERMISSION_CONTEXT_H_
+#define CHROME_BROWSER_PAYMENTS_PAYMENT_HANDLER_PERMISSION_CONTEXT_H_
+
+#include "base/macros.h"
+#include "chrome/browser/permissions/permission_context_base.h"
+
+class Profile;
+
+namespace payments {
+
+class PaymentHandlerPermissionContext : public PermissionContextBase {
+ public:
+  explicit PaymentHandlerPermissionContext(Profile* profile);
+  ~PaymentHandlerPermissionContext() override;
+
+ private:
+  // PermissionContextBase
+  bool IsRestrictedToSecureOrigins() const override;
+
+  DISALLOW_COPY_AND_ASSIGN(PaymentHandlerPermissionContext);
+};
+
+}  // namespace payments
+
+#endif  // CHROME_BROWSER_PAYMENTS_PAYMENT_HANDLER_PERMISSION_CONTEXT_H_