Force incremental marking steps in incremental-marking-job only if

src/heap/incremental-marking-job.cc

Index: src/heap/incremental-marking-job.cc
diff --git a/src/heap/incremental-marking-job.cc b/src/heap/incremental-marking-job.cc
index 43e8b7628f6c862ac4aa4c29354f4e505ec974d1..7e8e5f251f3c591574fd9f20564432a8f05f07e2 100644
--- a/src/heap/incremental-marking-job.cc
+++ b/src/heap/incremental-marking-job.cc
@@ -53,7 +53,7 @@ void IncrementalMarkingJob::ScheduleIdleTask(Heap* heap) {
 
 
 void IncrementalMarkingJob::ScheduleDelayedTask(Heap* heap) {
-  if (!delayed_task_pending_) {
+  if (!delayed_task_pending_ && FLAG_memory_reducer) {
     v8::Isolate* isolate = reinterpret_cast<v8::Isolate*>(heap->isolate());
     delayed_task_pending_ = true;
     made_progress_since_last_delayed_task_ = false;