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

Source/platform/heap/Handle.h

Index: Source/platform/heap/Handle.h
diff --git a/Source/platform/heap/Handle.h b/Source/platform/heap/Handle.h
index a95426684b0ffd7ad8cce17444a2859c59c36b93..ef091d456fe7e7c4389a5c0086e81515afd609c4 100644
--- a/Source/platform/heap/Handle.h
+++ b/Source/platform/heap/Handle.h
@@ -40,6 +40,7 @@
 #include "wtf/RawPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/TypeTraits.h"
+#include "wtf/UnretainedPtr.h"
 
 namespace blink {
 
@@ -1160,6 +1161,10 @@ 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