Check if Member owner thread matches pointer thread and current thread

third_party/WebKit/Source/platform/heap/WrapperVisitor.h

 // Copyright 2016 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 WrapperVisitor_h
 #define WrapperVisitor_h
 
 #include "platform/PlatformExport.h"
 #include "wtf/Allocator.h"
 
@@ skipping 97 matching lines @@
             TraceTrait<T>::heapObjectHeader,
             traceable);
     }
 
     template<typename T>
     void traceWrappers(const Member<T>& t) const
     {
         traceWrappers(t.get());
     }
 
+    template<typename T>
+    void traceWrappers(const WeakMember<T>& t) const
+    {
+        traceWrappers(t.get());
+    }
+
     virtual void traceWrappers(const ScopedPersistent<v8::Value>* persistent) const = 0;
     virtual void traceWrappers(const ScopedPersistent<v8::Object>* persistent) const = 0;
     virtual void markWrapper(const v8::PersistentBase<v8::Object>* persistent) const = 0;
 
     virtual void dispatchTraceWrappers(const ScriptWrappable*) const = 0;
 #define DECLARE_DISPATCH_TRACE_WRAPPERS(className)                   \
     virtual void dispatchTraceWrappers(const className*) const = 0;
 
     WRAPPER_VISITOR_SPECIAL_CLASSES(DECLARE_DISPATCH_TRACE_WRAPPERS);
 
 #undef DECLARE_DISPATCH_TRACE_WRAPPERS
     virtual void dispatchTraceWrappers(const void*) const = 0;
 
     virtual bool markWrapperHeader(HeapObjectHeader*) const = 0;
     virtual void markWrappersInAllWorlds(const ScriptWrappable*) const = 0;
     virtual void markWrappersInAllWorlds(const void*) const = 0;
     virtual void pushToMarkingDeque(
         void (*traceWrappersCallback)(const WrapperVisitor*, const void*),
         HeapObjectHeader* (*heapObjectHeaderCallback)(const void*),
         const void*) const = 0;
 };
 
 } // namespace blink
 
 #endif // WrapperVisitor_h