[heap] Minor MC: Add marking

src/heap/gc-idle-time-handler.h

Index: src/heap/gc-idle-time-handler.h
diff --git a/src/heap/gc-idle-time-handler.h b/src/heap/gc-idle-time-handler.h
index 7ce0c1a2f60f84c9d39b8f3351d934144edf2c23..398c62bf2f34867d2581253591d6671030a5ace5 100644
--- a/src/heap/gc-idle-time-handler.h
+++ b/src/heap/gc-idle-time-handler.h
@@ -125,6 +125,8 @@ class V8_EXPORT_PRIVATE GCIdleTimeHandler {
   GCIdleTimeAction Compute(double idle_time_in_ms,
                            GCIdleTimeHeapState heap_state);
 
+  bool Enabled();
+
   void ResetNoProgressCounter() { idle_times_which_made_no_progress_ = 0; }
 
   static size_t EstimateMarkingStepSize(double idle_time_in_ms,
@@ -142,6 +144,7 @@ class V8_EXPORT_PRIVATE GCIdleTimeHandler {
 
   static bool ShouldDoOverApproximateWeakClosure(double idle_time_in_ms);
 
+
  private:
   GCIdleTimeAction NothingOrDone(double idle_time_in_ms);