Move code around in IdleNotification.

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index f460b55960d58e1fd08e91c651c413bd31b8b848..4535bbb2cb08b4139e10b6a83cf97c92b2c57332 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -2118,6 +2118,18 @@ class Heap {
       double idle_time_in_ms, size_t size_of_objects,
       size_t mark_compact_speed_in_bytes_per_ms);
 
+  GCIdleTimeHandler::HeapState ComputeHeapState(bool reduce_memory);
+
+  bool PerformIdleTimeAction(GCIdleTimeAction action,
+                             GCIdleTimeHandler::HeapState heap_state,
+                             double deadline_in_ms,
+                             bool is_long_idle_notification);
+
+  void IdleNotificationEpilogue(GCIdleTimeAction action,
+                                GCIdleTimeHandler::HeapState heap_state,
+                                double start_ms, double deadline_in_ms,
+                                bool is_long_idle_notification);
+
   void ClearObjectStats(bool clear_last_time_stats = false);
 
   inline void UpdateAllocationsHash(HeapObject* object);