[Tracing] Embed V8 runtime call stats into tracing.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 1c11997d392ceda436d6ec0fc9e5ace18f40e1fc..3225a394d1057399a9cabc2948f7f8ea6510e4a5 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -9346,6 +9346,12 @@ Handle<Map> Map::TransitionToDataProperty(Handle<Map> map, Handle<Name> name,
       *map, map->is_prototype_map()
                 ? &RuntimeCallStats::PrototypeMap_TransitionToDataProperty
                 : &RuntimeCallStats::Map_TransitionToDataProperty);
+  TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_SCOPED(
+      map->GetIsolate(),
+      (map->is_prototype_map()
+           ? &tracing::TraceEventStatsTable::
+                 PrototypeMap_TransitionToDataProperty
+           : &tracing::TraceEventStatsTable::Map_TransitionToDataProperty))
 
   DCHECK(name->IsUniqueName());
   DCHECK(!map->is_dictionary_map());
@@ -9432,6 +9438,12 @@ Handle<Map> Map::TransitionToAccessorProperty(Isolate* isolate, Handle<Map> map,
       map->is_prototype_map()
           ? &RuntimeCallStats::PrototypeMap_TransitionToAccessorProperty
           : &RuntimeCallStats::Map_TransitionToAccessorProperty);
+  TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_SCOPED(
+      isolate,
+      (map->is_prototype_map()
+           ? &tracing::TraceEventStatsTable::
+                 PrototypeMap_TransitionToAccessorProperty
+           : &tracing::TraceEventStatsTable::Map_TransitionToAccessorProperty));
 
   // At least one of the accessors needs to be a new value.
   DCHECK(!getter->IsNull(isolate) || !setter->IsNull(isolate));
@@ -12328,6 +12340,8 @@ Handle<Cell> Map::GetOrCreatePrototypeChainValidityCell(Handle<Map> map,
 void Map::SetPrototype(Handle<Map> map, Handle<Object> prototype,
                        PrototypeOptimizationMode proto_mode) {
   RuntimeCallTimerScope stats_scope(*map, &RuntimeCallStats::Map_SetPrototype);
+  TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_SCOPED(
+      map->GetIsolate(), &tracing::TraceEventStatsTable::Map_SetPrototype);
 
   bool is_hidden = false;
   if (prototype->IsJSObject()) {