Reduce context disposal gc overhead.

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

Index: src/heap/gc-idle-time-handler.h
diff --git a/src/heap/gc-idle-time-handler.h b/src/heap/gc-idle-time-handler.h
index afb177d41d6bf7e17bff52570d8cff620c9c9924..e3a74627e56dd7da81fd3699cbae20c3bcfaa719 100644
--- a/src/heap/gc-idle-time-handler.h
+++ b/src/heap/gc-idle-time-handler.h
@@ -162,6 +162,9 @@ class GCIdleTimeHandler {
                                   size_t size_of_objects,
                                   size_t mark_compact_speed_in_bytes_per_ms);
 
+  static bool ShouldDoContextDisposalMarkCompact(bool context_disposed,
+                                                 double contexts_disposal_rate);
+
   static bool ShouldDoScavenge(
       size_t idle_time_in_ms, size_t new_space_size, size_t used_new_space_size,
       size_t scavenger_speed_in_bytes_per_ms,