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// 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;