--- old/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	2019-01-28 17:43:32.000000000 +0800
+++ new/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp	2019-01-28 17:43:31.000000000 +0800
@@ -1,5 +1,5 @@
   /*
- * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -75,7 +75,6 @@
 class G1OldTracer;
 class EvacuationFailedInfo;
 class nmethod;
-class Ticks;
 
 typedef OverflowTaskQueue<StarTask, mtGC>         RefToScanQueue;
 typedef GenericTaskQueueSet<RefToScanQueue, mtGC> RefToScanQueueSet;
@@ -1082,6 +1081,7 @@
 
   ConcurrentGCTimer* gc_timer_cm() const { return _gc_timer_cm; }
   G1OldTracer* gc_tracer_cm() const { return _gc_tracer_cm; }
+  G1NewTracer* gc_tracer_stw() const { return _gc_tracer_stw; }
 
   virtual size_t capacity() const;
   virtual size_t used() const;