[Tracing] Fix runtime call stats tracing for GC.

src/heap/gc-tracer.cc

Index: src/heap/gc-tracer.cc
diff --git a/src/heap/gc-tracer.cc b/src/heap/gc-tracer.cc
index 706d3546a2c5d574d7224e118395ca5c81ff6691..620a021be0959940edb4e58eee45f43211de76da 100644
--- a/src/heap/gc-tracer.cc
+++ b/src/heap/gc-tracer.cc
@@ -25,23 +25,23 @@ GCTracer::Scope::Scope(GCTracer* tracer, ScopeId scope)
     : tracer_(tracer), scope_(scope) {
   start_time_ = tracer_->heap_->MonotonicallyIncreasingTimeInMs();
   // TODO(cbruni): remove once we fully moved to a trace-based system.
-  if (FLAG_runtime_call_stats) {
+  if (TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_ENABLED() ||
+      FLAG_runtime_call_stats) {
     RuntimeCallStats::Enter(
         tracer_->heap_->isolate()->counters()->runtime_call_stats(), &timer_,
         &RuntimeCallStats::GC);
   }
-  // TODO(lpy): Add a tracing equivalent for the runtime call stats.
 }
 
 GCTracer::Scope::~Scope() {
   tracer_->AddScopeSample(
       scope_, tracer_->heap_->MonotonicallyIncreasingTimeInMs() - start_time_);
   // TODO(cbruni): remove once we fully moved to a trace-based system.
-  if (FLAG_runtime_call_stats) {
+  if (TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_ENABLED() ||
+      FLAG_runtime_call_stats) {
     RuntimeCallStats::Leave(
         tracer_->heap_->isolate()->counters()->runtime_call_stats(), &timer_);
   }
-  // TODO(lpy): Add a tracing equivalent for the runtime call stats.
 }
 
 const char* GCTracer::Scope::Name(ScopeId id) {
@@ -217,11 +217,11 @@ void GCTracer::Start(GarbageCollector collector,
                                                           committed_memory);
   counters->aggregated_memory_heap_used()->AddSample(start_time, used_memory);
   // TODO(cbruni): remove once we fully moved to a trace-based system.
-  if (FLAG_runtime_call_stats) {
+  if (TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_ENABLED() ||
+      FLAG_runtime_call_stats) {
     RuntimeCallStats::Enter(heap_->isolate()->counters()->runtime_call_stats(),
                             &timer_, &RuntimeCallStats::GC);
   }
-  // TODO(lpy): Add a tracing equivalent for the runtime call stats.
 }
 
 void GCTracer::MergeBaseline(const Event& baseline) {
@@ -323,11 +323,11 @@ void GCTracer::Stop(GarbageCollector collector) {
   }
 
   // TODO(cbruni): remove once we fully moved to a trace-based system.
-  if (FLAG_runtime_call_stats) {
+  if (TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_ENABLED() ||
+      FLAG_runtime_call_stats) {
     RuntimeCallStats::Leave(heap_->isolate()->counters()->runtime_call_stats(),
                             &timer_);
   }
-  // TODO(lpy): Add a tracing equivalent for the runtime call stats.
 }