Finish implementation and tests of 5 ARIA 1.1 attributes.

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.
 
 #import "content/browser/accessibility/browser_accessibility_cocoa.h"
 
 #include <execinfo.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <string.h>
@@ skipping 1355 matching lines @@
   if (browserAccessibility_->IsWebAreaForPresentationalIframe())
     return NSAccessibilityGroupRole;
 
   return [AXPlatformNodeCocoa nativeRoleFromAXRole:role];
 }
 
 // Returns a string indicating the role description of this object.
 - (NSString*)roleDescription {
   if (![self instanceActive])
     return nil;
+
+  if (browserAccessibility_->HasStringAttribute(
+      ui::AX_ATTR_ROLE_DESCRIPTION)) {
+    return NSStringForStringAttribute(
+        browserAccessibility_, ui::AX_ATTR_ROLE_DESCRIPTION);
+  }
+
   NSString* role = [self role];
 
   ContentClient* content_client = content::GetContentClient();
 
   // The following descriptions are specific to webkit.
   if ([role isEqualToString:@"AXWebArea"]) {
     return base::SysUTF16ToNSString(content_client->GetLocalizedString(
         IDS_AX_ROLE_WEB_AREA));
   }
 
@@ skipping 1425 matching lines @@
 }
 
 - (BOOL)accessibilityNotifiesWhenDestroyed {
   // Indicate that BrowserAccessibilityCocoa will post a notification when it's
   // destroyed (see -detach). This allows VoiceOver to do some internal things
   // more efficiently.
   return YES;
 }
 
 @end