[heap] Start concurrent marking simultaneously with incremental marking.

src/heap/concurrent-marking.h

Index: src/heap/concurrent-marking.h
diff --git a/src/heap/concurrent-marking.h b/src/heap/concurrent-marking.h
index 70842cd230d01c13810026bd5c28f4c6a0aa2c1a..98468996c37bce9a8501861c82efed3f918230d8 100644
--- a/src/heap/concurrent-marking.h
+++ b/src/heap/concurrent-marking.h
@@ -28,11 +28,14 @@ class ConcurrentMarking {
   void StartMarkingTask();
   void WaitForTaskToComplete();
 
+  bool IsMarkingInProgress() { return is_task_pending_; }

[Hannes Payer (out of office), 2017/03/08 12:58:50]

IsInProgress

[ulan, 2017/03/10 16:45:26]

I named it IsTaskPending().

+
  private:
   class Task;
   Heap* heap_;
-  base::Semaphore pending_task_;
+  base::Semaphore pending_task_semaphore_;

[Michael Lippautz, 2017/03/08 19:14:34]

super nit (feel free to ignore): We could align naming with Sweeper here (names
are pending_sweeper_tasks_semaphore_ , sweeping_in_progress_)

[ulan, 2017/03/10 16:45:26]

We will probably (re-)start the tasks multiple times in one marking round. I'll
keep the flag task specific.

   std::vector<HeapObject*> root_set_;
+  bool is_task_pending_;
 };
 
 }  // namespace internal