Add support for allowing an embedder to get the V8 profile timer event logs.

src/counters.cc

Index: src/counters.cc
diff --git a/src/counters.cc b/src/counters.cc
index e0a6a60a0a4086eb9478afe491d42593026c2cc2..12811f6f361319b5803b90cabec85e27874706ff 100644
--- a/src/counters.cc
+++ b/src/counters.cc
@@ -62,6 +62,7 @@ void HistogramTimer::Start() {
   if (Enabled()) {
     timer_.Start();
   }
+  LOG_EVENT_BEGIN(isolate(), name());
   if (FLAG_log_internal_timer_events) {
     LOG(isolate(), TimerEvent(Logger::START, name()));
   }
@@ -75,6 +76,7 @@ void HistogramTimer::Stop() {
     AddSample(static_cast<int>(timer_.Elapsed().InMilliseconds()));
     timer_.Stop();
   }
+  LOG_EVENT_END(isolate(), name());
   if (FLAG_log_internal_timer_events) {
     LOG(isolate(), TimerEvent(Logger::END, name()));
   }