Implement type=radio and radiogroup attribute for menuitem.

Source/core/html/HTMLMenuItemElement.cpp

Index: Source/core/html/HTMLMenuItemElement.cpp
diff --git a/Source/core/html/HTMLMenuItemElement.cpp b/Source/core/html/HTMLMenuItemElement.cpp
index 79d6759ffca96ab5b80873e38fc0bade7e363d41..25b231252321a4d4818dc8afd2779fe98e4bc528 100644
--- a/Source/core/html/HTMLMenuItemElement.cpp
+++ b/Source/core/html/HTMLMenuItemElement.cpp
@@ -6,6 +6,7 @@
 #include "core/html/HTMLMenuItemElement.h"
 
 #include "core/HTMLNames.h"
+#include "core/dom/ElementTraversal.h"
 #include "core/events/Event.h"
 
 namespace blink {
@@ -25,6 +26,18 @@ void HTMLMenuItemElement::defaultEventHandler(Event* event)
                 removeAttribute(checkedAttr);
             else
                 setAttribute(checkedAttr, "checked");
+        } else if (equalIgnoringCase(fastGetAttribute(typeAttr), "radio")) {
+            if (Element* parent = parentElement()) {
+                Element* nextElement = ElementTraversal::firstWithin(*parent);
+                String group = fastGetAttribute(radiogroupAttr);
+                while (nextElement) {

[tkent, 2014/12/09 13:02:26]

for (HTMLMenuItemElement& menuItem :
Traversal<HTMLMenuItemElement>::childrenOf(*parent)) {
    ....
}

+                    if (isHTMLMenuItemElement(*nextElement) && nextElement->fastHasAttribute(checkedAttr) && equalIgnoringCase(nextElement->fastGetAttribute(radiogroupAttr), group)) {

[tkent, 2014/12/09 12:43:43]

Why equalsIgnoringCase?  The specification says "exactly matches"

+                        nextElement->removeAttribute(checkedAttr);
+                    }
+                    nextElement = Traversal<HTMLElement>::nextSibling(*nextElement);
+                }
+            }
+            setAttribute(checkedAttr, "checked");
         }
         event->setDefaultHandled();
     }