Update from https://crrev.com/318214

tools/clang/blink_gc_plugin/tests/heap/stubs.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 HEAP_STUBS_H_
 #define HEAP_STUBS_H_
 
 #include "stddef.h"
 
 #define WTF_MAKE_FAST_ALLOCATED                 \
@@ skipping 194 matching lines @@
 class PersistentHeapVector : public Vector<T, 0, HeapAllocator> { };
 
 template <typename Derived>
 class VisitorHelper {
 public:
     template<typename T>
     void trace(const T&);
 };
 
 class Visitor : public VisitorHelper<Visitor> {
- public:
+public:
     template<typename T, void (T::*method)(Visitor*)>
     void registerWeakMembers(const T* obj);
 };
 
+class InlinedGlobalMarkingVisitor
+    : public VisitorHelper<InlinedGlobalMarkingVisitor> {
+public:
+     InlinedGlobalMarkingVisitor* operator->() { return this; }
+};
+
 class GarbageCollectedMixin {
 public:
     virtual void adjustAndMark(Visitor*) const = 0;
     virtual bool isHeapObjectAlive(Visitor*) const = 0;
     virtual void trace(Visitor*) { }
 };
 
 template<typename T>
 struct TraceIfNeeded {
     static void trace(Visitor*, T*);
@@ skipping 13 matching lines @@
 namespace WTF {
 
 template<typename T>
 struct VectorTraits<blink::Member<T> > {
     static const bool needsDestruction = false;
 };
 
 }
 
 #endif