Take freed handles into account when scheduling idle GCs.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index eb7c7a8cd12525a5e97342b841eceb8f0d1e2551..72769fe385a2f98e1ff633fef759667d3cb3d1f6 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -931,7 +931,7 @@ bool Heap::CollectGarbage(GarbageCollector collector, const char* gc_reason,
     }
 
     if (collector == MARK_COMPACTOR) {
-      gc_idle_time_handler_.NotifyMarkCompact();
+      gc_idle_time_handler_.NotifyMarkCompact(next_gc_likely_to_collect_more);

[Hannes Payer (out of office), 2015/05/20 11:39:13]

Here it would also make sense to take fragmentation into account. We can do that
as a separate CL. Maybe leave a todo here.

[ulan, 2015/05/20 11:45:10]

I wanted to add fragmentation check after landing
https://codereview.chromium.org/1038313003/. I'll keep this in mind.

     } else {
       gc_idle_time_handler_.NotifyScavenge();
     }