[binding] Check own property on named property accessor

Source/bindings/v8/custom/V8CSSStyleDeclarationCustom.cpp

 /*
  * Copyright (C) 2007-2011 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 175 matching lines @@
     // Successful lookups have the same cost the first time, but are cached.
     if (cssPropertyInfo(v8Name))
         return v8Integer(0, info.GetIsolate());
 
     return v8::Handle<v8::Integer>();
 }
 
 v8::Handle<v8::Value> V8CSSStyleDeclaration::namedPropertyGetter(v8::Local<v8::String> name, const v8::AccessorInfo& info)
 {
     // First look for API defined attributes on the style declaration object.
+    if (!info.Holder()->GetRealNamedPropertyInPrototypeChain(name).IsEmpty())
+        return v8Undefined();
     if (info.Holder()->HasRealNamedCallbackProperty(name))
         return v8Undefined();
+    if (info.Holder()->HasRealNamedProperty(name))
+        return v8Undefined();
 
     // Search the style declaration.
     CSSPropertyInfo* propInfo = cssPropertyInfo(name);
 
     // Do not handle non-property names.
     if (!propInfo)
         return v8Undefined();
 
     CSSStyleDeclaration* imp = V8CSSStyleDeclaration::toNative(info.Holder());
     RefPtr<CSSValue> cssValue = imp->getPropertyCSSValueInternal(static_cast<CSSPropertyID>(propInfo->propID));
     if (cssValue) {
         if (propInfo->hadPixelOrPosPrefix
             && cssValue->isPrimitiveValue()) {
             return v8::Number::New(static_cast<CSSPrimitiveValue*>(
                 cssValue.get())->getFloatValue(CSSPrimitiveValue::CSS_PX));
         }
         return v8StringOrNull(cssValue->cssText(), info.GetIsolate());
     }
 
     String result = imp->getPropertyValueInternal(static_cast<CSSPropertyID>(propInfo->propID));
     if (result.isNull())
         result = ""; // convert null to empty string.
 
     return v8String(result, info.GetIsolate());
 }
 
 v8::Handle<v8::Value> V8CSSStyleDeclaration::namedPropertySetter(v8::Local<v8::String> name, v8::Local<v8::Value> value, const v8::AccessorInfo& info)
 {
+    if (!info.Holder()->GetRealNamedPropertyInPrototypeChain(name).IsEmpty())
+        return v8Undefined();
+    if (info.Holder()->HasRealNamedCallbackProperty(name))
+        return v8Undefined();
+    if (info.Holder()->HasRealNamedProperty(name))
+        return v8Undefined();
+
     CSSStyleDeclaration* imp = V8CSSStyleDeclaration::toNative(info.Holder());
     CSSPropertyInfo* propInfo = cssPropertyInfo(name);
     if (!propInfo)
         return v8Undefined();
 
     String propertyValue = toWebCoreStringWithNullCheck(value);
     if (propInfo->hadPixelOrPosPrefix)
         propertyValue.append("px");
 
     ExceptionCode ec = 0;
     imp->setPropertyInternal(static_cast<CSSPropertyID>(propInfo->propID), propertyValue, false, ec);
 
     if (ec)
         setDOMException(ec, info.GetIsolate());
 
     return value;
 }
 
 } // namespace WebCore