Use EmbedderHeapTracer instead of object grouping when trace_embedder_heap flag is set

src/heap/mark-compact.h

Index: src/heap/mark-compact.h
diff --git a/src/heap/mark-compact.h b/src/heap/mark-compact.h
index cd207bcda27ba792ec2291abead68006c86932be..00ddefa78e7bc5678c40317176e54eb3b4eb3dcf 100644
--- a/src/heap/mark-compact.h
+++ b/src/heap/mark-compact.h
@@ -577,6 +577,12 @@ class MarkCompactCollector {
     return nullptr;
   }
 
+  std::vector<std::pair<void*, void*>>& wrappers_to_trace() {
+    return wrappers_to_trace_;
+  }
+
+  bool UsingEmbedderHeapTracer() const;
+
  private:
   class EvacuateNewSpaceVisitor;
   class EvacuateOldSpaceVisitor;
@@ -813,6 +819,8 @@ class MarkCompactCollector {
   base::VirtualMemory* marking_deque_memory_;
   size_t marking_deque_memory_committed_;
   MarkingDeque marking_deque_;
+  std::vector<std::pair<void*, void*>> wrappers_to_trace_;
+
   CodeFlusher* code_flusher_;
   bool have_code_to_deoptimize_;