Take freed handles into account when scheduling idle GCs.

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 efa4869956e3f7c5f7f22a6ad2c05f65de443779..5c0a80a1d25653107afac42b393bc16179977646 100644
--- a/src/heap/gc-idle-time-handler.h
+++ b/src/heap/gc-idle-time-handler.h
@@ -197,13 +197,17 @@ class GCIdleTimeHandler {
         long_idle_notifications_(0),
         background_idle_notifications_(0),
         idle_times_which_made_no_progress_per_mode_(0),
+        next_gc_likely_to_collect_more_(false),
         mode_(kReduceLatency) {}
 
   GCIdleTimeAction Compute(double idle_time_in_ms, HeapState heap_state);
 
   void NotifyIdleMarkCompact() { ++idle_mark_compacts_; }
 
-  void NotifyMarkCompact() { ++mark_compacts_; }
+  void NotifyMarkCompact(bool next_gc_likely_to_collect_more) {
+    next_gc_likely_to_collect_more_ = next_gc_likely_to_collect_more;
+    ++mark_compacts_;
+  }
 
   void NotifyScavenge() { ++scavenges_; }
 
@@ -261,6 +265,8 @@ class GCIdleTimeHandler {
   // Idle notifications with no progress in the current mode.
   int idle_times_which_made_no_progress_per_mode_;
 
+  bool next_gc_likely_to_collect_more_;
+
   Mode mode_;
 
   DISALLOW_COPY_AND_ASSIGN(GCIdleTimeHandler);