[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 9b26b75f33f5c46d93a0517e766de2a7e5e92f99..25f698fcb82af5212401748be5b2fd099076542f 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -9179,6 +9179,12 @@ 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());
@@ -9265,6 +9271,12 @@ 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));
@@ -12146,6 +12158,8 @@ 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()) {