Adds AXExpandedChanged for general roles.

content/browser/accessibility/browser_accessibility_manager_mac.mm

 // Copyright (c) 2012 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.
 
 #include "content/browser/accessibility/browser_accessibility_manager_mac.h"
 
 #import "base/mac/mac_util.h"
 #import "base/mac/sdk_forward_declarations.h"
 #include "base/logging.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 49 matching lines @@
 NSString* const NSAccessibilityAutocorrectionOccurredNotification =
     @"AXAutocorrectionOccurred";
 NSString* const NSAccessibilityLayoutCompleteNotification =
     @"AXLayoutComplete";
 NSString* const NSAccessibilityLoadCompleteNotification =
     @"AXLoadComplete";
 NSString* const NSAccessibilityInvalidStatusChangedNotification =
     @"AXInvalidStatusChanged";
 NSString* const NSAccessibilityLiveRegionChangedNotification =
     @"AXLiveRegionChanged";
+NSString* const NSAccessibilityExpandedChanged =
+    @"AXExpandedChanged";
 NSString* const NSAccessibilityMenuItemSelectedNotification =
     @"AXMenuItemSelected";
 
 // Attributes used for NSAccessibilitySelectedTextChangedNotification and
 // NSAccessibilityValueChangedNotification.
 NSString* const NSAccessibilityTextStateChangeTypeKey =
     @"AXTextStateChangeType";
 NSString* const NSAccessibilityTextStateSyncKey = @"AXTextStateSync";
 NSString* const NSAccessibilityTextSelectionDirection =
     @"AXTextSelectionDirection";
@@ skipping 185 matching lines @@
       break;
     case ui::AX_EVENT_ROW_COUNT_CHANGED:
       mac_notification = NSAccessibilityRowCountChangedNotification;
       break;
     case ui::AX_EVENT_ROW_EXPANDED:
       mac_notification = NSAccessibilityRowExpandedNotification;
       break;
     case ui::AX_EVENT_ROW_COLLAPSED:
       mac_notification = NSAccessibilityRowCollapsedNotification;
       break;
-    // TODO(nektar): Add events for busy and expanded changed.
+    // TODO(nektar): Add events for busy.
+    case ui::AX_EVENT_EXPANDED_CHANGED:
+      mac_notification = NSAccessibilityExpandedChanged;
+      break;
     // TODO(nektar): Support menu open/close notifications.
     case ui::AX_EVENT_MENU_LIST_ITEM_SELECTED:
       mac_notification = NSAccessibilityMenuItemSelectedNotification;
       break;
 
     // These events are not used on Mac for now.
     case ui::AX_EVENT_ALERT:
     case ui::AX_EVENT_TEXT_CHANGED:
     case ui::AX_EVENT_CHILDREN_CHANGED:
     case ui::AX_EVENT_MENU_LIST_VALUE_CHANGED:
@@ skipping 170 matching lines @@
   }
 
   return @{
     NSAccessibilityTextStateChangeTypeKey : @(AXTextStateChangeTypeEdit),
     NSAccessibilityTextChangeValues : changes,
     NSAccessibilityTextChangeElement : native_node
   };
 }
 
 }  // namespace content