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

src/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 201 matching lines @@
   bool lookup_done_;
 
   // Add a single sample to this histogram.
   void AddSample(int sample);
 
   // Returns true if this histogram is enabled.
   bool Enabled() {
     return GetHistogram() != NULL;
   }
 
+  // Reset the cached internal pointer.
+  void Reset() {
+    lookup_done_ = false;
+  }
+
  protected:
   // Returns the handle to the histogram.
   void* GetHistogram() {
     if (!lookup_done_) {
       lookup_done_ = true;
       histogram_ = CreateHistogram();
     }
     return histogram_;
   }
 
@@ skipping 12 matching lines @@
   // Start the timer.
   void Start();
 
   // Stop the timer and record the results.
   void Stop();
 
   // Returns true if the timer is running.
   bool Running() {
     return histogram_.Enabled() && (start_time_ != 0) && (stop_time_ == 0);
   }
+
+  void Reset() {
+    histogram_.Reset();
+  }
 };
 
 // Helper class for scoping a HistogramTimer.
 class HistogramTimerScope BASE_EMBEDDED {
  public:
   explicit HistogramTimerScope(HistogramTimer* timer) :
   timer_(timer) {
     timer_->Start();
   }
   ~HistogramTimerScope() {
     timer_->Stop();
   }
  private:
   HistogramTimer* timer_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_COUNTERS_H_