Add support for allowing an embedder to get the V8 profile timer event logs.

src/isolate.cc

Index: src/isolate.cc
diff --git a/src/isolate.cc b/src/isolate.cc
index 2d45d78b0364e5da57b7858ebca9218ad49b3ca6..6e94aa88cd707cd19179abaed0d3471e110525cf 100644
--- a/src/isolate.cc
+++ b/src/isolate.cc
@@ -2016,6 +2016,12 @@ bool Isolate::Init(Deserializer* des) {
   bootstrapper_->Initialize(create_heap_objects);
   builtins_.SetUp(this, create_heap_objects);
 
+  if (!event_logger_ && FLAG_log_internal_timer_events) {

[Yang, 2014/03/07 08:48:42]

I don't think we need to check for !event_logger_.

+    set_event_logger(Logger::LogInternalEvents);
+  } else {
+    set_event_logger(Logger::EmptyLogInternalEvents);
+  }
+
   // Set default value if not yet set.
   // TODO(yangguo): move this to ResourceConstraints::ConfigureDefaults
   // once ResourceConstraints becomes an argument to the Isolate constructor.