SameThreadCheckedMember<>: verify same-thread usage of heap references.

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

 // Copyright 2015 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 TraceTraits_h
 #define TraceTraits_h
 
 #include "platform/heap/GCInfo.h"
 #include "platform/heap/Heap.h"
 #include "platform/heap/InlinedGlobalMarkingVisitor.h"
@@ skipping 342 matching lines @@
 
 template <typename T>
 class TraceEagerlyTrait<Member<T>> {
   STATIC_ONLY(TraceEagerlyTrait);
 
  public:
   static const bool value = TraceEagerlyTrait<T>::value;
 };
 
 template <typename T>
+class TraceEagerlyTrait<SameThreadCheckedMember<T>> {
+  STATIC_ONLY(TraceEagerlyTrait);
+
+ public:
+  static const bool value = TraceEagerlyTrait<T>::value;
+};
+
+template <typename T>
 class TraceEagerlyTrait<TraceWrapperMember<T>> {
   STATIC_ONLY(TraceEagerlyTrait);
 
  public:
   static const bool value = TraceEagerlyTrait<T>::value;
 };
 
 template <typename T>
 class TraceEagerlyTrait<WeakMember<T>> {
   STATIC_ONLY(TraceEagerlyTrait);
@@ skipping 399 matching lines @@
     // since iterating over the hash table backing will find the whole
     // chain.
     visitor->markNoTracing(node);
     return false;
   }
 };
 
 }  // namespace WTF
 
 #endif