Implement computedRole and computedName (behind a flag)

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 1353 matching lines @@
         if (axObj) {
             AccessibilityRole role = axObj->roleValue();
             if (role != GroupRole && role != UnknownRole)
                 break;
         }
     }
 
     return String();
 }
 
+String AXNodeObject::computedName() const
+{
+    String title = this->title();
+
+    String titleUIText;
+    if (title.isEmpty()) {
+        AXObject* titleUIElement = this->titleUIElement();
+        if (titleUIElement) {
+            titleUIText = titleUIElement->textUnderElement();
+            if (!titleUIText.isEmpty())
+                return titleUIText;
+        }
+    }
+
+    String description = accessibilityDescription();
+    if (!description.isEmpty())
+        return description;
+
+    if (!title.isEmpty())
+        return title;
+
+    String placeholder;
+    if (isHTMLInputElement(node())) {
+        HTMLInputElement* element = toHTMLInputElement(node());
+        placeholder = element->strippedPlaceholder();
+        if (!placeholder.isEmpty())
+            return placeholder;
+    }
+
+    return String();
+}
+
+
+
 LayoutRect AXNodeObject::elementRect() const
 {
     // First check if it has a custom rect, for example if this element is tied to a canvas path.
     if (!m_explicitElementRect.isEmpty())
         return m_explicitElementRect;
 
     // FIXME: If there are a lot of elements in the canvas, it will be inefficient.
     // We can avoid the inefficient calculations by using AXComputedObjectAttributeCache.
     if (node()->parentElement()->isInCanvasSubtree()) {
         LayoutRect rect;
@@ skipping 453 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