Make sure that there is enough time left before finishing incremental marking in idle notification.

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index 587b67bdf064c771de14f9b08bb9d839773c5b56..5acb130a51021c13a50a285fcacd0fbc8a866baa 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -1090,7 +1090,7 @@ class Heap {
   void DisableInlineAllocation();
 
   // Implements the corresponding V8 API function.
-  bool IdleNotification(int hint);
+  bool IdleNotification(int idle_time_in_ms);
 
   // Declare all the root indices.  This defines the root list order.
   enum RootListIndex {
@@ -2065,6 +2065,8 @@ class Heap {
 
   void AdvanceIdleIncrementalMarking(intptr_t step_size);
 
+  void FinalizeIdleIncrementalMarking();
+
   void ClearObjectStats(bool clear_last_time_stats = false);
 
   void set_weak_object_to_code_table(Object* value) {