Mark timed range in the profile plot.

src/log.cc

Index: src/log.cc
diff --git a/src/log.cc b/src/log.cc
index f6dfd2161d89b425c89b97f741acf8a3160b3a05..a916482283fd5653de7d32260f7043363aa67ea9 100644
--- a/src/log.cc
+++ b/src/log.cc
@@ -1084,6 +1084,16 @@ void Logger::CodeDeoptEvent(Code* code) {
 }
 
 
+void Logger::CurrentTimeEvent() {
+  if (!log_->IsEnabled()) return;
+  ASSERT(FLAG_log_internal_timer_events);
+  Log::MessageBuilder msg(log_);
+  int since_epoch = static_cast<int>(timer_.Elapsed().InMicroseconds());
+  msg.Append("current-time,%ld\n", since_epoch);
+  msg.WriteToLogFile();
+}
+
+
 void Logger::TimerEvent(StartEnd se, const char* name) {
   if (!log_->IsEnabled()) return;
   ASSERT(FLAG_log_internal_timer_events);