[Tracing] Embed V8 runtime call stats into tracing.

src/arguments.h

Index: src/arguments.h
diff --git a/src/arguments.h b/src/arguments.h
index 34fbca4feacda2ca3b7eec59b054b107bb32c5b4..9c629ce936e6319e44c30dbf1913b6a6e8acf870 100644
--- a/src/arguments.h
+++ b/src/arguments.h
@@ -88,16 +88,17 @@ double ClobberDoubleRegisters(double x1, double x2, double x3, double x4);
   V8_NOINLINE static Type Stats_##Name(int args_length, Object** args_object, \
                                        Isolate* isolate) {                    \
     RuntimeCallTimerScope timer(isolate, &RuntimeCallStats::Name);            \
-    TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.runtime"),                     \
-                 "V8.Runtime_" #Name);                                        \
     Arguments args(args_length, args_object);                                 \
+    TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_SCOPED(                            \
+        isolate, &tracing::TraceEventStatsTable::Name);                       \
     return __RT_impl_##Name(args, isolate);                                   \
   }                                                                           \
                                                                               \
   Type Name(int args_length, Object** args_object, Isolate* isolate) {        \
     CHECK(isolate->context() == nullptr || isolate->context()->IsContext());  \
     CLOBBER_DOUBLE_REGISTERS();                                               \
-    if (FLAG_runtime_call_stats) {                                            \
+    if (V8_UNLIKELY(TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_ENABLED() ||       \
+                    FLAG_runtime_call_stats)) {                               \
       return Stats_##Name(args_length, args_object, isolate);                 \
     }                                                                         \
     Arguments args(args_length, args_object);                                 \