Return timestamp of the last recorded interval to the caller of HeapProfiler::GetHeapStats

src/heap-profiler.h

Index: src/heap-profiler.h
diff --git a/src/heap-profiler.h b/src/heap-profiler.h
index 562d9b9c792c14220177cd8924940aab9d27fc06..68e13656c66b05296f26d452048f6267a69b0e45 100644
--- a/src/heap-profiler.h
+++ b/src/heap-profiler.h
@@ -33,7 +33,8 @@ class HeapProfiler {
   HeapObjectsMap* heap_object_map() const { return ids_.get(); }
   StringsStorage* names() const { return names_.get(); }
 
-  SnapshotObjectId PushHeapObjectsStats(OutputStream* stream);
+  SnapshotObjectId PushHeapObjectsStats(OutputStream* stream,
+                                        int64_t* timestamp_us);
   int GetSnapshotsCount();
   HeapSnapshot* GetSnapshot(int index);
   SnapshotObjectId GetSnapshotObjectId(Handle<Object> obj);