PaymentHandler: Implement requestPermission().

chrome/browser/payments/payment_handler_permission_context.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 "chrome/browser/payments/payment_handler_permission_context.h"
+
+#include "components/content_settings/core/common/content_settings_types.h"
+#include "third_party/WebKit/public/platform/WebFeaturePolicyFeature.h"
+
+namespace payments {
+
+PaymentHandlerPermissionContext::PaymentHandlerPermissionContext(
+    Profile* profile)
+    : PermissionContextBase(profile,
+                            CONTENT_SETTINGS_TYPE_PAYMENT_HANDLER,
+                            blink::WebFeaturePolicyFeature::kNotFound) {}
+
+PaymentHandlerPermissionContext::~PaymentHandlerPermissionContext() {}
+
+bool PaymentHandlerPermissionContext::IsRestrictedToSecureOrigins() const {
+  return true;
+}
+
+}  // namespace payments