[wrapper-tracing] Support for incrementally tracing ScopedPersistent

third_party/WebKit/Source/bindings/core/v8/ScriptWrappable.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "bindings/core/v8/ScriptWrappable.h"
 
 #include "bindings/core/v8/DOMDataStore.h"
 #include "bindings/core/v8/ScriptWrappableVisitor.h"
 #include "bindings/core/v8/V8DOMWrapper.h"
 
@@ skipping 23 matching lines @@
 v8::Local<v8::Object> ScriptWrappable::associateWithWrapper(
     v8::Isolate* isolate,
     const WrapperTypeInfo* wrapperTypeInfo,
     v8::Local<v8::Object> wrapper) {
   return V8DOMWrapper::associateObjectWithWrapper(isolate, this,
                                                   wrapperTypeInfo, wrapper);
 }
 
 void ScriptWrappable::markWrapper(const WrapperVisitor* visitor) const {
   if (containsWrapper())
-    visitor->markWrapper(&m_mainWorldWrapper);
+    visitor->markWrapper(&m_mainWorldWrapper.As<v8::Value>());
 }
 
 }  // namespace blink