Add condition for checking AXExpanded on mac.

content/browser/accessibility/browser_accessibility_cocoa.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 <execinfo.h>
 
 #import "content/browser/accessibility/browser_accessibility_cocoa.h"
 
 #include <map>
 
@@ skipping 1172 matching lines @@
 // Returns the list of accessibility attributes that this object supports.
 - (NSArray*)accessibilityAttributeNames {
   if (!browserAccessibility_)
     return nil;
 
   // General attributes.
   NSMutableArray* ret = [NSMutableArray arrayWithObjects:
       NSAccessibilityChildrenAttribute,
       NSAccessibilityDescriptionAttribute,
       NSAccessibilityEnabledAttribute,
-      NSAccessibilityExpandedAttribute,
       NSAccessibilityFocusedAttribute,
       NSAccessibilityHelpAttribute,
       NSAccessibilityLinkedUIElementsAttribute,
       NSAccessibilityParentAttribute,
       NSAccessibilityPositionAttribute,
       NSAccessibilityRoleAttribute,
       NSAccessibilityRoleDescriptionAttribute,
       NSAccessibilitySizeAttribute,
       NSAccessibilitySubroleAttribute,
       NSAccessibilityTitleAttribute,
@@ skipping 108 matching lines @@
         nil]];
   }
   if (browserAccessibility_->HasStringAttribute(
           ui::AX_ATTR_CONTAINER_LIVE_STATUS)) {
     [ret addObjectsFromArray:[NSArray arrayWithObjects:
         @"AXARIAAtomic",
         @"AXARIABusy",
         nil]];
   }
 
+  //Add expanded attribute only if it has expanded or collapsed state.
+  if (GetState(browserAccessibility_,ui::AX_STATE_EXPANDED) ||
+        GetState(browserAccessibility_,ui::AX_STATE_COLLAPSED)) {
+    [ret addObjectsFromArray:[NSArray arrayWithObjects:
+        NSAccessibilityExpandedAttribute,
+        nil]];
+  }
+
   // Title UI Element.
   if (browserAccessibility_->HasIntAttribute(ui::AX_ATTR_TITLE_UI_ELEMENT) ||
       (browserAccessibility_->HasIntListAttribute(ui::AX_ATTR_LABELLEDBY_IDS) &&
        browserAccessibility_->GetIntListAttribute(ui::AX_ATTR_LABELLEDBY_IDS)
                             .size() == 1)) {
     [ret addObjectsFromArray:[NSArray arrayWithObjects:
          NSAccessibilityTitleUIElementAttribute,
          nil]];
   }
   // TODO(aboxhall): expose NSAccessibilityServesAsTitleForUIElementsAttribute
@@ skipping 142 matching lines @@
     return [super hash];
   return browserAccessibility_->GetId();
 }
 
 - (BOOL)accessibilityShouldUseUniqueId {
   return YES;
 }
 
 @end