[multivm] Re-split fields for V8 and Dart wrappers.

Source/bindings/core/v8/V8ScriptWrappable.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 "config.h"
 #include "bindings/core/v8/V8ScriptWrappable.h"
 
 #include "bindings/core/v8/DOMDataStore.h"
 #include "bindings/core/v8/V8DOMWrapper.h"
 
 namespace blink {
 
 #if COMPILER(MSVC)
 __declspec(align(4))
 #endif
 struct SameSizeAsScriptWrappableBase { };
 
 COMPILE_ASSERT(sizeof(ScriptWrappableBase) <= sizeof(SameSizeAsScriptWrappableBase), ScriptWrappableBase_should_stay_small);
 
 struct SameSizeAsScriptWrappable : public ScriptWrappableBase {
     virtual ~SameSizeAsScriptWrappable() { }
-    uintptr_t m_wrapper;
+    uintptr_t m_v8Wrapper;
+    uintptr_t m_dartWrapperInfo;
 };
 
 COMPILE_ASSERT(sizeof(ScriptWrappable) <= sizeof(SameSizeAsScriptWrappable), ScriptWrappable_should_stay_small);
 
 v8::Handle<v8::Object> ScriptWrappable::wrap(v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
 {
     ASSERT(!DOMDataStore::containsWrapperNonTemplate(this, isolate));
 
     const WrapperTypeInfo* wrapperType = wrapperTypeInfo();
 
     v8::Handle<v8::Object> wrapper = V8DOMWrapper::createWrapper(creationContext, wrapperType, toScriptWrappableBase(), isolate);
     if (UNLIKELY(wrapper.IsEmpty()))
         return wrapper;
 
     wrapperType->installConditionallyEnabledProperties(wrapper, isolate);
     return associateWithWrapper(wrapperType, wrapper, isolate);
 }
 
 v8::Handle<v8::Object> ScriptWrappable::associateWithWrapper(const WrapperTypeInfo* wrapperType, v8::Handle<v8::Object> wrapper, v8::Isolate* isolate)
 {
     wrapperType->refObject(toScriptWrappableBase());
     V8DOMWrapper::associateObjectWithWrapperNonTemplate(this, wrapperType, wrapper, isolate);
     return wrapper;
 }
 
 } // namespace blink