[heap] Minor MC: Add marking

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

 // Copyright 2014 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_GC_IDLE_TIME_HANDLER_H_
 #define V8_HEAP_GC_IDLE_TIME_HANDLER_H_
 
 #include "src/globals.h"
 
 namespace v8 {
@@ skipping 107 matching lines @@
   // Number of times we will return a Nothing action in the current mode
   // despite having idle time available before we returning a Done action to
   // ensure we don't keep scheduling idle tasks and making no progress.
   static const int kMaxNoProgressIdleTimes = 10;
 
   GCIdleTimeHandler() : idle_times_which_made_no_progress_(0) {}
 
   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,
                                         double marking_speed_in_bytes_per_ms);
 
   static double EstimateFinalIncrementalMarkCompactTime(
       size_t size_of_objects, double mark_compact_speed_in_bytes_per_ms);
 
   static bool ShouldDoContextDisposalMarkCompact(int context_disposed,
                                                  double contexts_disposal_rate);
 
   static bool ShouldDoFinalIncrementalMarkCompact(
       double idle_time_in_ms, size_t size_of_objects,
       double final_incremental_mark_compact_speed_in_bytes_per_ms);
 
   static bool ShouldDoOverApproximateWeakClosure(double idle_time_in_ms);
 
+
  private:
   GCIdleTimeAction NothingOrDone(double idle_time_in_ms);
 
   // Idle notifications with no progress.
   int idle_times_which_made_no_progress_;
 
   DISALLOW_COPY_AND_ASSIGN(GCIdleTimeHandler);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_GC_IDLE_TIME_HANDLER_H_