Add a host parameter to ObjectVisitor methods.

src/heap/concurrent-marking.cc

 // Copyright 2017 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/heap/concurrent-marking.h"
 
 #include <stack>
 #include <unordered_map>
 
 #include "src/heap/heap-inl.h"
@@ skipping 34 matching lines @@
   void FreeBitmap(Bitmap* bitmap) { free(bitmap); }
 
  private:
   std::unordered_map<MemoryChunk*, Bitmap*> bitmap_;
 };
 
 class ConcurrentMarkingVisitor : public ObjectVisitor {
  public:
   ConcurrentMarkingVisitor() {}
 
-  void VisitPointers(Object** start, Object** end) override {
+  void VisitPointers(HeapObject* host, Object** start, Object** end) override {
     for (Object** p = start; p < end; p++) {
       if (!(*p)->IsHeapObject()) continue;
       MarkObject(HeapObject::cast(*p));
     }
   }
 
   void MarkObject(HeapObject* obj) {
     if (markbits_.Mark(obj)) {
       marking_stack_.push(obj);
     }
@@ skipping 58 matching lines @@
       v8::Platform::kShortRunningTask);
 }
 
 void ConcurrentMarking::WaitForTaskToComplete() {
   if (!FLAG_concurrent_marking) return;
   pending_task_.Wait();
 }
 
 }  // namespace internal
 }  // namespace v8