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diff --git a/chromium/content/common/ax_serialization_utils.h b/chromium/content/common/ax_serialization_utils.h
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+++ b/chromium/content/common/ax_serialization_utils.h
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+// Copyright 2020 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.
+
+// Utilities to ensure that accessibility tree serialization and deserialization
+// logic is in sync.
+
+#ifndef CONTENT_COMMON_AX_SERIALIZATION_UTILS_H_
+#define CONTENT_COMMON_AX_SERIALIZATION_UTILS_H_
+
+namespace content {
+
+// Returns true if page scale factor should be included in the transform on the
+// root node of the AX tree.
+bool AXShouldIncludePageScaleFactorInRoot();
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_AX_SERIALIZATION_UTILS_H_