[Tracing] Embed V8 runtime call stats into tracing.

src/counters.h

Index: src/counters.h
diff --git a/src/counters.h b/src/counters.h
index 397b0f39f09dc52c6e8bc825614155970497dc4a..8c98a2b7cd2c528a8e11cf86061f0af6d7790f25 100644
--- a/src/counters.h
+++ b/src/counters.h
@@ -482,6 +482,7 @@ double AggregatedMemoryHistogram<Histogram>::Aggregate(double current_ms,
 struct RuntimeCallCounter {
   explicit RuntimeCallCounter(const char* name) : name(name) {}
   void Reset();
+  void Dump(std::stringstream& out);

[Camillo Bruni, 2016/08/01 07:43:55]

nit: Please mark as non-inlined (V8_NOINLINE void ...)
TraceEventStatsTable::Dump otherwise might end up being a huge function (we had
a report of 150KB ;)

[lpy, 2016/08/01 18:17:55]

Done.

 
   const char* name;
   int64_t count = 0;