ui/accessibility/mojom/ax_tree_id.mojom

// Copyright 2018 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.

module ax.mojom;

import "ui/accessibility/ax_enums.mojom";
import "mojo/public/mojom/base/unguessable_token.mojom";

union AXTreeID {
  // Placeholder for an unknown AXTreeID. The value of this field is not used.
  uint8 unknown;

  // Any AXTreeID that's not unknown must be an UnguessableToken.
  mojo_base.mojom.UnguessableToken token;
};