--- old/src/share/vm/runtime/timer.hpp	2015-02-17 09:48:41.831526547 +0100
+++ new/src/share/vm/runtime/timer.hpp	2015-02-17 09:48:41.771524805 +0100
@@ -27,6 +27,8 @@
 
 #include "utilities/globalDefinitions.hpp"
 
+class GCPhaseTimeTracker;
+
 // Timers for simple measurement.
 
 class elapsedTimer VALUE_OBJ_CLASS_SPEC {
@@ -103,6 +105,17 @@
   void resume()   { if (_active) _t.start(); }
 };
 
+class TrackPhaseTime VALUE_OBJ_CLASS_SPEC {
+ private:
+  GCPhaseTimeTracker* _data;
+  uint          _phase;
+  jlong         _last;
+ public:
+  // Constructors
+  TrackPhaseTime(GCPhaseTimeTracker *data, uint phase);
+  ~TrackPhaseTime();
+};
+
 class TraceCPUTime: public StackObj {
  private:
   bool _active;                 // true if times will be measured and printed