Make sure Document::updateLayoutTree*() is called before Element::isFocusable().

third_party/WebKit/Source/modules/accessibility/AXNodeObject.cpp

 /*
  * Copyright (C) 2012, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 500 matching lines @@
     if ((m_ariaRole = determineAriaRoleAttribute()) != UnknownRole)
         return m_ariaRole;
     if (node()->isTextNode())
         return StaticTextRole;
 
     AccessibilityRole role = nativeAccessibilityRoleIgnoringAria();
     if (role != UnknownRole)
         return role;
     if (node()->isElementNode()) {
         Element* element = toElement(node());
-        if (element->isInCanvasSubtree() && element->isFocusable())
-            return GroupRole;
+        if (element->isInCanvasSubtree()) {
+            document()->updateLayoutTreeIgnorePendingStylesheets();
+            if (element->isFocusable())
+                return GroupRole;
+        }
     }
     return UnknownRole;
 }
 
 AccessibilityRole AXNodeObject::determineAriaRoleAttribute() const
 {
     const AtomicString& ariaRole = getAttribute(roleAttr);
     if (ariaRole.isNull() || ariaRole.isEmpty())
         return UnknownRole;
 
@@ skipping 2215 matching lines @@
     return placeholder;
 }
 
 DEFINE_TRACE(AXNodeObject)
 {
     visitor->trace(m_node);
     AXObject::trace(visitor);
 }
 
 } // namespace blink