Use idle task to perform incremental marking steps.

src/heap/heap.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HEAP_HEAP_H_
 #define V8_HEAP_HEAP_H_
 
 #include <cmath>
 #include <map>
 
@@ skipping 849 matching lines @@
 
   // Performs incremental marking steps of step_size_in_bytes as long as
   // deadline_ins_ms is not reached. step_size_in_bytes can be 0 to compute
   // an estimate increment. Returns the remaining time that cannot be used
   // for incremental marking anymore because a single step would exceed the
   // deadline.
   double AdvanceIncrementalMarking(
       intptr_t step_size_in_bytes, double deadline_in_ms,
       IncrementalMarking::StepActions step_actions);
 
+  bool TryFinalizeIdleIncrementalMarking(double idle_time_in_ms);
+
   inline void increment_scan_on_scavenge_pages() {
     scan_on_scavenge_pages_++;
     if (FLAG_gc_verbose) {
       PrintF("Scan-on-scavenge pages: %d\n", scan_on_scavenge_pages_);
     }
   }
 
   inline void decrement_scan_on_scavenge_pages() {
     scan_on_scavenge_pages_--;
     if (FLAG_gc_verbose) {
@@ skipping 1354 matching lines @@
 
   void SelectScavengingVisitorsTable();
 
   bool HasLowYoungGenerationAllocationRate();
   bool HasLowOldGenerationAllocationRate();
   double YoungGenerationMutatorUtilization();
   double OldGenerationMutatorUtilization();
 
   void ReduceNewSpaceSize();
 
-  bool TryFinalizeIdleIncrementalMarking(
-      double idle_time_in_ms, size_t size_of_objects,
-      size_t mark_compact_speed_in_bytes_per_ms);
-
   GCIdleTimeHandler::HeapState ComputeHeapState();
 
   bool PerformIdleTimeAction(GCIdleTimeAction action,
                              GCIdleTimeHandler::HeapState heap_state,
                              double deadline_in_ms);
 
   void IdleNotificationEpilogue(GCIdleTimeAction action,
                                 GCIdleTimeHandler::HeapState heap_state,
                                 double start_ms, double deadline_in_ms);
   void CheckAndNotifyBackgroundIdleNotification(double idle_time_in_ms,
@@ skipping 585 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_HEAP_H_