--- a/hotspot/src/share/vm/gc/g1/g1CollectedHeap.hpp	Thu Apr 13 11:23:37 2017 -0700
+++ b/hotspot/src/share/vm/gc/g1/g1CollectedHeap.hpp	Thu Apr 13 16:38:39 2017 -0400
@@ -1438,6 +1438,11 @@
   // full GC.
   void verify(VerifyOption vo);
 
+  // WhiteBox testing support.
+  virtual bool supports_concurrent_phase_control() const;
+  virtual const char* const* concurrent_phases() const;
+  virtual bool request_concurrent_phase(const char* phase);
+
   // The methods below are here for convenience and dispatch the
   // appropriate method depending on value of the given VerifyOption
   // parameter. The values for that parameter, and their meanings,