1 files changed, 14 insertions, 1 deletions
diff --git a/Source/WebCore/bindings/v8/WrapperTypeInfo.h b/Source/WebCore/bindings/v8/WrapperTypeInfo.h
index 1d1cbfd..166d642 100644
--- a/Source/WebCore/bindings/v8/WrapperTypeInfo.h
+++ b/Source/WebCore/bindings/v8/WrapperTypeInfo.h
@@ -41,7 +41,9 @@ namespace WebCore {
     static const int v8DOMWrapperObjectIndex = 1;
     static const int v8DOMHiddenReferenceArrayIndex = 2;
     static const int v8DefaultWrapperInternalFieldCount = 3;
-    
+
+    static const uint16_t v8DOMSubtreeClassId = 1;
+
     typedef v8::Persistent<v8::FunctionTemplate> (*GetTemplateFunction)();
     typedef void (*DerefObjectFunction)(void*);
     typedef ActiveDOMObject* (*ToActiveDOMObjectFunction)(v8::Handle<v8::Object>);
@@ -61,6 +63,16 @@ namespace WebCore {
         {
             return this == that;
         }
+
+        bool isSubclass(const WrapperTypeInfo* that) const
+        {
+            for (const WrapperTypeInfo* current = this; current; current = current->parentClass) {
+                if (current == that)
+                    return true;
+            }
+
+            return false;
+        }
         
         v8::Persistent<v8::FunctionTemplate> getTemplate() { return getTemplateFunction(); }
         
@@ -80,6 +92,7 @@ namespace WebCore {
         const GetTemplateFunction getTemplateFunction;
         const DerefObjectFunction derefObjectFunction;
         const ToActiveDOMObjectFunction toActiveDOMObjectFunction;
+        const WrapperTypeInfo* parentClass;
     };
 }