Integrate Chrome tracing with V8 (WIP)

src/log-inl.h

Index: src/log-inl.h
diff --git a/src/log-inl.h b/src/log-inl.h
index a96631d059d1a5dd0dffb7d3ebd9ec9d2cd64584..ac8903054f07f91f532a249442459af026257609 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 {
@@ -28,12 +29,24 @@ Logger::LogEventsAndTags Logger::ToNativeByScript(Logger::LogEventsAndTags tag,
 
 
 void Logger::CallEventLogger(Isolate* isolate, const char* name, StartEnd se,
-                             bool expose_to_api) {
-  if (isolate->event_logger() != NULL) {
-    if (isolate->event_logger() == DefaultEventLoggerSentinel) {
-      LOG(isolate, TimerEvent(se, name));
-    } else if (expose_to_api) {
-      isolate->event_logger()(name, se);
+                             Overhead overhead) {
+  if (overhead == Overhead::NORMAL) {
+    if (se == START) {
+      TRACE_EVENT_BEGIN0("V8", name);
+    } else {
+      TRACE_EVENT_END0("V8", name);
+    }
+  } else if (overhead == Overhead::LOW) {
+    if (se == START) {
+      TRACE_EVENT_BEGIN0("benchmark", name);
+    } else {
+      TRACE_EVENT_END0("benchmark", name);
+    }
+  } else {
+    if (se == START) {
+      TRACE_EVENT_BEGIN0(TRACE_DISABLED_BY_DEFAULT("V8Disabled"), name);
+    } else {
+      TRACE_EVENT_END0(TRACE_DISABLED_BY_DEFAULT("V8Disabled"), name);
     }
   }
 }