[Tracing] Fix runtime call stats tracing for GC.

src/counters-inl.h

Index: src/counters-inl.h
diff --git a/src/counters-inl.h b/src/counters-inl.h
index 44424d3ba458ec9abc0c61ccb8e598c8febecfe7..e0e824b063eb268b34493410968f4d5d9f79f66f 100644
--- a/src/counters-inl.h
+++ b/src/counters-inl.h
@@ -12,12 +12,16 @@ namespace internal {
 
 RuntimeCallTimerScope::RuntimeCallTimerScope(
     HeapObject* heap_object, RuntimeCallStats::CounterId counter_id) {
-  if (V8_UNLIKELY(FLAG_runtime_call_stats)) {
+  if (V8_UNLIKELY(TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_ENABLED())) {
+    isolate_ = heap_object->GetIsolate();
+    is_tracing_ = true;
+    RuntimeCallStats::Enter(isolate_->counters()->tracing_runtime_call_stats(),
+                            &timer_, counter_id);
+  } else if (V8_UNLIKELY(FLAG_runtime_call_stats)) {
     isolate_ = heap_object->GetIsolate();
     RuntimeCallStats::Enter(isolate_->counters()->runtime_call_stats(), &timer_,
                             counter_id);
   }
-  // TODO(lpy): Add a tracing equivalent for the runtime call stats.
 }
 
 }  // namespace internal