Fix idle step marking after 9d7ebc.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index c8372f468bf22b7446e9cf6ccb1bcf21a0c03cf6..e37c9f6b11de8b333743e8f296486d3561721013 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -4859,7 +4859,7 @@ bool Heap::PerformIdleTimeAction(GCIdleTimeAction action,
     case DO_INCREMENTAL_MARKING: {
       const double remaining_idle_time_in_ms =
           AdvanceIncrementalMarking(action.parameter, deadline_in_ms,
-                                    IncrementalMarking::NoForcedStepActions());
+                                    IncrementalMarking::IdleStepActions());
       if (remaining_idle_time_in_ms > 0.0) {
         action.additional_work = TryFinalizeIdleIncrementalMarking(
             remaining_idle_time_in_ms, heap_state.size_of_objects,