Implement tracing interface for v8

src/log-inl.h

Index: src/log-inl.h
diff --git a/src/log-inl.h b/src/log-inl.h
index a96631d059d1a5dd0dffb7d3ebd9ec9d2cd64584..e263ddcc8f7b7e33496505ebc7adf9edf4e9ef2f 100644
--- a/src/log-inl.h
+++ b/src/log-inl.h
@@ -7,6 +7,7 @@
 
 #include "src/log.h"
 #include "src/isolate.h"
+#include "src/tracing/trace-event.h"
 
 namespace v8 {
 namespace internal {
@@ -34,6 +35,11 @@ void Logger::CallEventLogger(Isolate* isolate, const char* name, StartEnd se,
       LOG(isolate, TimerEvent(se, name));
     } else if (expose_to_api) {
       isolate->event_logger()(name, se);
+      if (se == START) {
+        TRACE_EVENT_BEGIN0("v8", name);
+      } else {
+        TRACE_EVENT_END0("v8", name);
+      }
     }
   }
 }