Add a trace-event for each runtime-stats timer

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 4164df55d8db6723e2177182dfaa0ce26800960e..6bc38eb01e16ddea018ca81a5d5cfe55c9af22a8 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -9161,6 +9161,9 @@ Handle<Map> Map::TransitionToDataProperty(Handle<Map> map, Handle<Name> name,
       *map, map->is_prototype_map()
                 ? &RuntimeCallStats::PrototypeMap_TransitionToDataProperty
                 : &RuntimeCallStats::Map_TransitionToDataProperty);
+  TRACE_RUNTIME_CALL(map->is_prototype_map()
+                         ? "PrototypeMap_TransitionToDataProperty"
+                         : "Map_TransitionToDataProperty");
 
   DCHECK(name->IsUniqueName());
   DCHECK(!map->is_dictionary_map());
@@ -9247,6 +9250,9 @@ Handle<Map> Map::TransitionToAccessorProperty(Isolate* isolate, Handle<Map> map,
       map->is_prototype_map()
           ? &RuntimeCallStats::PrototypeMap_TransitionToAccessorProperty
           : &RuntimeCallStats::Map_TransitionToAccessorProperty);
+  TRACE_RUNTIME_CALL(map->is_prototype_map()
+                         ? "PrototypeMap_TransitionToAccessorProperty"
+                         : "Map_TransitionToAccessorProperty");
 
   // At least one of the accessors needs to be a new value.
   DCHECK(!getter->IsNull() || !setter->IsNull());
@@ -12110,6 +12116,7 @@ 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_RUNTIME_CALL("Map_SetPrototype");
 
   bool is_hidden = false;
   if (prototype->IsJSObject()) {