[heap] Prepare IncrementalMarking::VisitObject for concurrent marking.

src/heap/incremental-marking.h

Index: src/heap/incremental-marking.h
diff --git a/src/heap/incremental-marking.h b/src/heap/incremental-marking.h
index 3b490c84eb294db9623230a3fd236e19ec395d91..2fc6919aea234d32a43467102f4bac7b8130bac6 100644
--- a/src/heap/incremental-marking.h
+++ b/src/heap/incremental-marking.h
@@ -290,6 +290,7 @@ class V8_EXPORT_PRIVATE IncrementalMarking {
       intptr_t bytes_to_process,
       ForceCompletionAction completion = DO_NOT_FORCE_COMPLETION));
 
+  INLINE(bool IsFixedArrayWithProgressBar(HeapObject* object));
   INLINE(void VisitObject(Map* map, HeapObject* obj, int size));
 
   void IncrementIdleMarkingDelayCounter();