Implement AggregatableHistogramTimer and use it to measure how much time

src/counters.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/base/platform/platform.h"
 #include "src/counters.h"
 #include "src/isolate.h"
 #include "src/log-inl.h"
@@ skipping 48 matching lines @@
 #define HR(name, caption, min, max, num_buckets) \
   name##_ = Histogram(#caption, min, max, num_buckets, isolate);
   HISTOGRAM_RANGE_LIST(HR)
 #undef HR
 
 #define HT(name, caption) \
     name##_ = HistogramTimer(#caption, 0, 10000, 50, isolate);
     HISTOGRAM_TIMER_LIST(HT)
 #undef HT
 
+#define AHT(name, caption) \
+  name##_ = AggregatableHistogramTimer(#caption, 0, 10000, 50, isolate);
+    AGGREGATABLE_HISTOGRAM_TIMER_LIST(AHT)
+#undef AHT
+
 #define HP(name, caption) \
     name##_ = Histogram(#caption, 0, 101, 100, isolate);
     HISTOGRAM_PERCENTAGE_LIST(HP)
 #undef HP
 
 #define HM(name, caption) \
     name##_ = Histogram(#caption, 1000, 500000, 50, isolate);
     HISTOGRAM_MEMORY_LIST(HM)
 #undef HM
 
@@ skipping 70 matching lines @@
 
 void Counters::ResetHistograms() {
 #define HR(name, caption, min, max, num_buckets) name##_.Reset();
   HISTOGRAM_RANGE_LIST(HR)
 #undef HR
 
 #define HT(name, caption) name##_.Reset();
     HISTOGRAM_TIMER_LIST(HT)
 #undef HT
 
+#define AHT(name, caption) name##_.Reset();
+    AGGREGATABLE_HISTOGRAM_TIMER_LIST(AHT)
+#undef AHT
+
 #define HP(name, caption) name##_.Reset();
     HISTOGRAM_PERCENTAGE_LIST(HP)
 #undef HP
 
 #define HM(name, caption) name##_.Reset();
     HISTOGRAM_MEMORY_LIST(HM)
 #undef HM
 }
 
 } }  // namespace v8::internal