Check whether aria-expanded attribute is defined

Source/web/WebAXObject.cpp

Index: Source/web/WebAXObject.cpp
diff --git a/Source/web/WebAXObject.cpp b/Source/web/WebAXObject.cpp
index 918d0bb5c2821ac2f281fff9ecdca5b72441d846..f303d3eeb470ae6a83d92a0db1f962538efdcbe5 100644
--- a/Source/web/WebAXObject.cpp
+++ b/Source/web/WebAXObject.cpp
@@ -274,12 +274,12 @@ bool WebAXObject::isEnabled() const
     return m_private->isEnabled();
 }
 
-bool WebAXObject::isExpanded() const
+WebAXExpanded WebAXObject::isExpanded() const
 {
     if (isDetached())
-        return 0;
+        return WebAXExpandedUndefined;
 
-    return m_private->isExpanded();
+    return static_cast<WebAXExpanded>(m_private->isExpanded());

[Mike West, 2014/10/29 15:25:05]

Without compile asserts verifying that WebAXExpanded matches, this isn't a safe
cast.

 }
 
 bool WebAXObject::isFocused() const