Use mayNotBeMainThread() for wrapper optimization

third_party/WebKit/Source/bindings/core/v8/ToV8.h

 // 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.
 
 #ifndef ToV8_h
 #define ToV8_h
 
 // ToV8() provides C++ -> V8 conversion. Note that ToV8() can return an empty
 // handle. Call sites must check IsEmpty() before using return value.
 
@@ skipping 28 matching lines @@
     return wrapper;
 
   wrapper = impl->wrap(isolate, creationContext);
   DCHECK(!wrapper.IsEmpty());
   return wrapper;
 }
 
 inline v8::Local<v8::Value> ToV8(Node* impl,
                                  v8::Local<v8::Object> creationContext,
                                  v8::Isolate* isolate) {
-  if (UNLIKELY(!impl))
-    return v8::Null(isolate);
-  v8::Local<v8::Value> wrapper = DOMDataStore::getWrapper(impl, isolate);
-  if (!wrapper.IsEmpty())
-    return wrapper;
-
-  wrapper = ScriptWrappable::fromNode(impl)->wrap(isolate, creationContext);
-  DCHECK(!wrapper.IsEmpty());
-  return wrapper;
+  return ToV8(ScriptWrappable::fromNode(impl), creationContext, isolate);
 }
 
 // Special versions for DOMWindow and EventTarget
 
 CORE_EXPORT v8::Local<v8::Value> ToV8(DOMWindow*,
                                       v8::Local<v8::Object> creationContext,
                                       v8::Isolate*);
 CORE_EXPORT v8::Local<v8::Value> ToV8(EventTarget*,
                                       v8::Local<v8::Object> creationContext,
                                       v8::Isolate*);
@@ skipping 261 matching lines @@
 // Cannot define in ScriptValue because of the circular dependency between toV8
 // and ScriptValue
 template <typename T>
 inline ScriptValue ScriptValue::from(ScriptState* scriptState, T&& value) {
   return ScriptValue(scriptState, ToV8(std::forward<T>(value), scriptState));
 }
 
 }  // namespace blink
 
 #endif  // ToV8_h