When specifying a new create histogram callback, reset all histograms so they recreate themselves o…

src/v8-counters.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 345 matching lines @@
 #define COUNTER_ID(name) k_##name,
     STATE_TAG_LIST(COUNTER_ID)
 #undef COUNTER_ID
     stats_counter_count
   };
 
   StatsCounter* state_counters(StateTag state) {
     return &state_counters_[state];
   }
 
+  void ResetHistograms();
+
  private:
 #define HT(name, caption) \
   HistogramTimer name##_;
   HISTOGRAM_TIMER_LIST(HT)
 #undef HT
 
 #define HP(name, caption) \
   Histogram name##_;
   HISTOGRAM_PERCENTAGE_LIST(HP)
 #undef HP
@@ skipping 32 matching lines @@
   // Sliding state window counters.
   StatsCounter state_counters_[kSlidingStateWindowCounterCount];
   friend class Isolate;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(Counters);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_V8_COUNTERS_H_