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

src/v8-counters.cc

 // 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 75 matching lines @@
     { "c:V8.State" #name, NULL, false },
     STATE_TAG_LIST(COUNTER_NAME)
 #undef COUNTER_NAME
   };
 
   for (int i = 0; i < kSlidingStateWindowCounterCount; ++i) {
     state_counters_[i] = state_counters[i];
   }
 }
 
+void Counters::ResetHistograms() {
+#define HT(name, caption) name##_.Reset();
+    HISTOGRAM_TIMER_LIST(HT)
+#undef HT
+
+#define HP(name, caption) name##_.Reset();
+    HISTOGRAM_PERCENTAGE_LIST(HP)
+#undef HP
+}
+
 } }  // namespace v8::internal