Split the TRACE_EVENTs from the LOG/HistogramTimers/TimerEvents functionality.

src/parsing/parser.cc

Index: src/parsing/parser.cc
diff --git a/src/parsing/parser.cc b/src/parsing/parser.cc
index ad3176433d976431da1ae301a3309d65b249e35c..f249534619afa93e5cef60d74ab11e49d7b01b69 100644
--- a/src/parsing/parser.cc
+++ b/src/parsing/parser.cc
@@ -23,6 +23,7 @@
 #include "src/parsing/scanner-character-streams.h"
 #include "src/runtime/runtime.h"
 #include "src/string-stream.h"
+#include "src/tracing/trace-event.h"
 
 namespace v8 {
 namespace internal {
@@ -795,6 +796,7 @@ FunctionLiteral* Parser::ParseProgram(Isolate* isolate, ParseInfo* info) {
   DCHECK(parsing_on_main_thread_);
 
   HistogramTimerScope timer_scope(isolate->counters()->parse(), true);
+  TRACE_EVENT0("v8", "V8.Parse");
   Handle<String> source(String::cast(info->script()->source()));
   isolate->counters()->total_parse_size()->Increment(source->length());
   base::ElapsedTimer timer;
@@ -963,6 +965,7 @@ FunctionLiteral* Parser::ParseLazy(Isolate* isolate, ParseInfo* info) {
   // called in the main thread.
   DCHECK(parsing_on_main_thread_);
   HistogramTimerScope timer_scope(isolate->counters()->parse_lazy());
+  TRACE_EVENT0("v8", "V8.ParseLazy");
   Handle<String> source(String::cast(info->script()->source()));
   isolate->counters()->total_parse_size()->Increment(source->length());
   base::ElapsedTimer timer;
@@ -4837,6 +4840,8 @@ PreParser::PreParseResult Parser::ParseLazyFunctionBodyWithPreParser(
   if (pre_parse_timer_ != NULL) {
     pre_parse_timer_->Start();
   }
+  TRACE_EVENT0("v8", "V8.PreParse");
+
   DCHECK_EQ(Token::LBRACE, scanner()->current_token());
 
   if (reusable_preparser_ == NULL) {