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diff --git a/chromium/ui/accessibility/platform/ax_private_webkit_constants_mac.h b/chromium/ui/accessibility/platform/ax_private_webkit_constants_mac.h
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+++ b/chromium/ui/accessibility/platform/ax_private_webkit_constants_mac.h
@@ -0,0 +1,96 @@
+// 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.
+
+#ifndef UI_ACCESSIBILITY_PLATFORM_AX_PRIVATE_WEBKIT_CONSTANTS_MAC_H_
+#define UI_ACCESSIBILITY_PLATFORM_AX_PRIVATE_WEBKIT_CONSTANTS_MAC_H_
+
+#import <Cocoa/Cocoa.h>
+#include "ui/accessibility/ax_export.h"
+
+namespace ui {
+
+enum AXTextStateChangeType {
+  AXTextStateChangeTypeUnknown,
+  AXTextStateChangeTypeEdit,
+  AXTextStateChangeTypeSelectionMove,
+  AXTextStateChangeTypeSelectionExtend
+};
+
+enum AXTextSelectionDirection {
+  AXTextSelectionDirectionUnknown,
+  AXTextSelectionDirectionBeginning,
+  AXTextSelectionDirectionEnd,
+  AXTextSelectionDirectionPrevious,
+  AXTextSelectionDirectionNext,
+  AXTextSelectionDirectionDiscontiguous
+};
+
+enum AXTextSelectionGranularity {
+  AXTextSelectionGranularityUnknown,
+  AXTextSelectionGranularityCharacter,
+  AXTextSelectionGranularityWord,
+  AXTextSelectionGranularityLine,
+  AXTextSelectionGranularitySentence,
+  AXTextSelectionGranularityParagraph,
+  AXTextSelectionGranularityPage,
+  AXTextSelectionGranularityDocument,
+  AXTextSelectionGranularityAll
+};
+
+enum AXTextEditType {
+  AXTextEditTypeUnknown,
+  AXTextEditTypeDelete,
+  AXTextEditTypeInsert,
+  AXTextEditTypeTyping,
+  AXTextEditTypeDictation,
+  AXTextEditTypeCut,
+  AXTextEditTypePaste,
+  AXTextEditTypeAttributesChange
+};
+
+// Native mac notifications fired.
+NSString* const NSAccessibilityAutocorrectionOccurredNotification =
+    @"AXAutocorrectionOccurred";
+NSString* const NSAccessibilityLoadCompleteNotification = @"AXLoadComplete";
+NSString* const NSAccessibilityInvalidStatusChangedNotification =
+    @"AXInvalidStatusChanged";
+NSString* const NSAccessibilityLiveRegionCreatedNotification =
+    @"AXLiveRegionCreated";
+NSString* const NSAccessibilityLiveRegionChangedNotification =
+    @"AXLiveRegionChanged";
+NSString* const NSAccessibilityExpandedChanged = @"AXExpandedChanged";
+NSString* const NSAccessibilityMenuItemSelectedNotification =
+    @"AXMenuItemSelected";
+
+// The following native mac notifications are not fired:
+// AXLayoutComplete: Voiceover does not use this, it is considered too spammy.
+
+// Attributes used for NSAccessibilitySelectedTextChangedNotification and
+// NSAccessibilityValueChangedNotification.
+NSString* const NSAccessibilityTextStateChangeTypeKey =
+    @"AXTextStateChangeType";
+NSString* const NSAccessibilityTextStateSyncKey = @"AXTextStateSync";
+NSString* const NSAccessibilityTextSelectionDirection =
+    @"AXTextSelectionDirection";
+NSString* const NSAccessibilityTextSelectionGranularity =
+    @"AXTextSelectionGranularity";
+NSString* const NSAccessibilityTextSelectionChangedFocus =
+    @"AXTextSelectionChangedFocus";
+NSString* const NSAccessibilityTextChangeElement = @"AXTextChangeElement";
+NSString* const NSAccessibilityTextEditType = @"AXTextEditType";
+NSString* const NSAccessibilityTextChangeValue = @"AXTextChangeValue";
+NSString* const NSAccessibilityChangeValueStartMarker =
+    @"AXTextChangeValueStartMarker";
+NSString* const NSAccessibilityTextChangeValueLength =
+    @"AXTextChangeValueLength";
+NSString* const NSAccessibilityTextChangeValues = @"AXTextChangeValues";
+
+AX_EXPORT const char* ToString(AXTextStateChangeType);
+AX_EXPORT const char* ToString(AXTextSelectionDirection);
+AX_EXPORT const char* ToString(AXTextSelectionGranularity);
+AX_EXPORT const char* ToString(AXTextEditType);
+
+}  // namespace ui
+
+#endif  // UI_ACCESSIBILITY_PLATFORM_AX_PRIVATE_WEBKIT_CONSTANTS_MAC_H_