Oilpan: A thread that is not attached to Oilpan shouldn't create a CrossThreadPersistent

Source/platform/heap/Handle.h

 /*
  * Copyright (C) 2014 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 22 matching lines @@
 
 #include "platform/heap/Heap.h"
 #include "platform/heap/ThreadState.h"
 #include "platform/heap/Visitor.h"
 #include "wtf/Functional.h"
 #include "wtf/HashFunctions.h"
 #include "wtf/Locker.h"
 #include "wtf/RawPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/TypeTraits.h"
+#include "wtf/UnretainedPtr.h"
 
 namespace blink {
 
 template<typename T> class HeapTerminatedArray;
 
 // Template to determine if a class is a GarbageCollectedMixin by checking if it
 // has adjustAndMark and isAlive. We can't check directly if the class is a
 // GarbageCollectedMixin because casting to it is potentially ambiguous.
 template<typename T>
 struct IsGarbageCollectedMixin {
@@ skipping 1100 matching lines @@
 };
 
 template<typename T>
 struct ParamStorageTraits<T*> : public PointerParamStorageTraits<T*, blink::IsGarbageCollectedType<T>::value> {
 };
 
 template<typename T>
 struct ParamStorageTraits<RawPtr<T> > : public PointerParamStorageTraits<T*, blink::IsGarbageCollectedType<T>::value> {
 };
 
+template<typename T>
+struct ParamStorageTraits<UnretainedPtr<T> > : public PointerParamStorageTraits<T*, false> {
+};
+
 } // namespace WTF
 
 #endif