Finalize sweeping in idle notification when all pages are swept.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 5af21e18c0df762e7efb97e2778e6e708ad8f066..85be7f897c5497b3de2d6e2d33c5878526c7520b 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -4616,6 +4616,8 @@ bool Heap::IdleNotification(double deadline_in_seconds) {
       !mark_compact_collector()->sweeping_in_progress();
   heap_state.sweeping_in_progress =
       mark_compact_collector()->sweeping_in_progress();
+  heap_state.sweeping_completed =
+      mark_compact_collector()->IsSweepingCompleted();
   heap_state.mark_compact_speed_in_bytes_per_ms =
       static_cast<size_t>(tracer()->MarkCompactSpeedInBytesPerMillisecond());
   heap_state.incremental_marking_speed_in_bytes_per_ms = static_cast<size_t>(