Implement Permissions.query() and static PermissionStatus.

public/platform/modules/permissions/WebPermissionType.h

+// Copyright 2015 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 WebPermissionType_h
+#define WebPermissionType_h
+
+namespace blink {
+
+enum WebPermissionType {
+    WebPermissionTypeGeolocation,
+    WebPermissionTypeNotifications,
+    WebPermissionTypePushNotifications,
+    WebPermissionTypeMidiSysEx,
+};
+
+} // namespace blink
+
+#endif // WebPermissionType_h