AXRequired should be exposed only when aria-required="true" or required attribute is present

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 1197 matching lines @@
       NSAccessibilityRoleAttribute,
       NSAccessibilityRoleDescriptionAttribute,
       NSAccessibilitySizeAttribute,
       NSAccessibilitySubroleAttribute,
       NSAccessibilityTitleAttribute,
       NSAccessibilityTopLevelUIElementAttribute,
       NSAccessibilityValueAttribute,
       NSAccessibilityWindowAttribute,
       @"AXAccessKey",
       @"AXInvalid",
-      @"AXRequired",
       @"AXVisited",
       nil];
 
   // Specific role attributes.
   NSString* role = [self role];
   NSString* subrole = [self subrole];
   if ([role isEqualToString:NSAccessibilityTableRole] ||
       [role isEqualToString:NSAccessibilityGridRole]) {
     [ret addObjectsFromArray:[NSArray arrayWithObjects:
         NSAccessibilityColumnsAttribute,
@@ skipping 115 matching lines @@
         NSAccessibilityExpandedAttribute,
         nil]];
   }
 
   if (GetState(browserAccessibility_, ui::AX_STATE_VERTICAL)
       || GetState(browserAccessibility_, ui::AX_STATE_HORIZONTAL)) {
     [ret addObjectsFromArray:[NSArray arrayWithObjects:
         NSAccessibilityOrientationAttribute, nil]];
   }
 
+  if (GetState(browserAccessibility_, ui::AX_STATE_REQUIRED)) {
+    [ret addObjectsFromArray:[NSArray arrayWithObjects:
+        @"AXRequired", 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