Add a host parameter to ObjectVisitor methods.

src/heap/concurrent-marking.cc

Index: src/heap/concurrent-marking.cc
diff --git a/src/heap/concurrent-marking.cc b/src/heap/concurrent-marking.cc
index c29e23c4c298d29c32a0fc02279d626632178219..887676ded888e13a8a749c8483777f0056572bbb 100644
--- a/src/heap/concurrent-marking.cc
+++ b/src/heap/concurrent-marking.cc
@@ -54,7 +54,7 @@ class ConcurrentMarkingVisitor : public ObjectVisitor {
  public:
   ConcurrentMarkingVisitor() : bytes_marked_(0) {}
 
-  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));