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..e7fab1c3dd3059b4bad0073fea44eb8a8b42fb86 100644
--- a/src/counters.cc
+++ b/src/counters.cc
@@ -62,9 +62,7 @@ void HistogramTimer::Start() {
   if (Enabled()) {
     timer_.Start();
   }
-  if (FLAG_log_internal_timer_events) {
-    LOG(isolate(), TimerEvent(Logger::START, name()));
-  }
+  isolate()->event_logger()(name(), Logger::START);
 }
 
 
@@ -75,9 +73,7 @@ void HistogramTimer::Stop() {
     AddSample(static_cast<int>(timer_.Elapsed().InMilliseconds()));
     timer_.Stop();
   }
-  if (FLAG_log_internal_timer_events) {
-    LOG(isolate(), TimerEvent(Logger::END, name()));
-  }
+  isolate()->event_logger()(name(), Logger::END);
 }
 
 } }  // namespace v8::internal