[Tracing] Embed V8 runtime call stats into tracing.

src/builtins/builtins-utils.h

Index: src/builtins/builtins-utils.h
diff --git a/src/builtins/builtins-utils.h b/src/builtins/builtins-utils.h
index f84d10a4a734bf23545a59150e38d855065d0c1a..13f426bcfbff84b0aa7b89eaa65685173402d800 100644
--- a/src/builtins/builtins-utils.h
+++ b/src/builtins/builtins-utils.h
@@ -85,8 +85,6 @@ class BuiltinArguments : public Arguments {
       int args_length, Object** args_object, Isolate* isolate) {             \
     BuiltinArguments args(args_length, args_object);                         \
     RuntimeCallTimerScope timer(isolate, &RuntimeCallStats::Builtin_##name); \
-    TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.runtime"),                    \
-                 "V8.Builtin_" #name);                                       \
     return Builtin_Impl_##name(args, isolate);                               \
   }                                                                          \
                                                                              \
@@ -97,7 +95,10 @@ class BuiltinArguments : public Arguments {
       return Builtin_Impl_Stats_##name(args_length, args_object, isolate);   \
     }                                                                        \
     BuiltinArguments args(args_length, args_object);                         \
-    return Builtin_Impl_##name(args, isolate);                               \
+    TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_SCOPED(                           \
+        isolate, &tracing::TraceEventStatsTable::Builtin_##name);            \
+    Object* result = Builtin_Impl_##name(args, isolate);                     \

[Camillo Bruni, 2016/07/27 08:29:07]

The same as for the runtime functions.
I'd like to keep all timers and stack-allocated scopes away from the default
functions.

+    return result;                                                           \
   }                                                                          \
                                                                              \
   MUST_USE_RESULT static Object* Builtin_Impl_##name(BuiltinArguments args,  \