Add live region root to the cached properties of an AXObject.

Source/core/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 1605 matching lines @@
     // called during render layouts, minimal work should be done.
     // If AX elements are created now, they could interrogate the render tree while it's in a funky state.
     // At the same time, process ARIA live region changes.
     for (AXObject* parent = this; parent; parent = parent->parentObjectIfExists()) {
         parent->setNeedsToUpdateChildren();
 
         // These notifications always need to be sent because screenreaders are reliant on them to perform.
         // In other words, they need to be sent even when the screen reader has not accessed this live region since the last update.
 
         // If this element supports ARIA live regions, then notify the AT of changes.
-        if (parent->supportsARIALiveRegion())
+        if (parent->isLiveRegion())
             axObjectCache()->postNotification(parent, parent->document(), AXObjectCacheImpl::AXLiveRegionChanged, true);
 
         // If this element is an ARIA text box or content editable, post a "value changed" notification on it
         // so that it behaves just like a native input element or textarea.
         if (isNonNativeTextControl())
             axObjectCache()->postNotification(parent, parent->document(), AXObjectCacheImpl::AXValueChanged, true);
     }
 }
 
 void AXNodeObject::selectionChanged()
@@ skipping 10 matching lines @@
 void AXNodeObject::textChanged()
 {
     // If this element supports ARIA live regions, or is part of a region with an ARIA editable role,
     // then notify the AT of changes.
     AXObjectCacheImpl* cache = axObjectCache();
     for (Node* parentNode = node(); parentNode; parentNode = parentNode->parentNode()) {
         AXObject* parent = cache->get(parentNode);
         if (!parent)
             continue;
 
-        if (parent->supportsARIALiveRegion())
+        if (parent->isLiveRegion())
             cache->postNotification(parentNode, AXObjectCacheImpl::AXLiveRegionChanged, true);
 
         // If this element is an ARIA text box or content editable, post a "value changed" notification on it
         // so that it behaves just like a native input element or textarea.
         if (parent->isNonNativeTextControl())
             cache->postNotification(parentNode, AXObjectCacheImpl::AXValueChanged, true);
     }
 }
 
 void AXNodeObject::updateAccessibilityRole()
@@ skipping 92 matching lines @@
     float range = maxValueForRange() - minValueForRange();
     float value = valueForRange();
 
     value += range * (percentChange / 100);
     setValue(String::number(value));
 
     axObjectCache()->postNotification(node(), AXObjectCacheImpl::AXValueChanged, true);
 }
 
 } // namespace blink