Add handling to respect role attribute in AXObjects.

Source/modules/accessibility/AXProgressIndicator.cpp

Index: Source/modules/accessibility/AXProgressIndicator.cpp
diff --git a/Source/modules/accessibility/AXProgressIndicator.cpp b/Source/modules/accessibility/AXProgressIndicator.cpp
index 3d68519d5bf68515f56e7976060883bf455d889a..c1411e29be7ebca82ff7d007557123434ca4cfab 100644
--- a/Source/modules/accessibility/AXProgressIndicator.cpp
+++ b/Source/modules/accessibility/AXProgressIndicator.cpp
@@ -40,6 +40,14 @@ PassRefPtr<AXProgressIndicator> AXProgressIndicator::create(LayoutProgress* layo
     return adoptRef(new AXProgressIndicator(layoutObject, axObjectCache));
 }
 
+AccessibilityRole AXProgressIndicator::roleValue() const
+{
+    AccessibilityRole ariaRole = ariaRoleAttribute();
+    if (ariaRole != UnknownRole)
+        return ariaRole;
+    return ProgressIndicatorRole;
+}
+
 bool AXProgressIndicator::computeAccessibilityIsIgnored() const
 {
     return accessibilityIsIgnoredByDefault();