[Tracing] Use TracingCategoryObserver in runtime statistics

src/arguments.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_ARGUMENTS_H_
 #define V8_ARGUMENTS_H_
 
 #include "src/allocation.h"
 #include "src/objects-inl.h"
 #include "src/tracing/trace-event.h"
@@ skipping 78 matching lines @@
     RuntimeCallTimerScope timer(isolate, &RuntimeCallStats::Name);            \
     TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.runtime"),                     \
                  "V8.Runtime_" #Name);                                        \
     Arguments args(args_length, args_object);                                 \
     return __RT_impl_##Name(args, isolate);                                   \
   }                                                                           \
                                                                               \
   Type Name(int args_length, Object** args_object, Isolate* isolate) {        \
     DCHECK(isolate->context() == nullptr || isolate->context()->IsContext()); \
     CLOBBER_DOUBLE_REGISTERS();                                               \
-    if (V8_UNLIKELY(TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_ENABLED() ||       \
-                    FLAG_runtime_call_stats)) {                               \
+    if (V8_UNLIKELY(FLAG_runtime_stats)) {                                    \
       return Stats_##Name(args_length, args_object, isolate);                 \
     }                                                                         \
     Arguments args(args_length, args_object);                                 \
     return __RT_impl_##Name(args, isolate);                                   \
   }                                                                           \
                                                                               \
   static Type __RT_impl_##Name(Arguments args, Isolate* isolate)
 
 #define RUNTIME_FUNCTION(Name) RUNTIME_FUNCTION_RETURNS_TYPE(Object*, Name)
 #define RUNTIME_FUNCTION_RETURN_PAIR(Name) \
     RUNTIME_FUNCTION_RETURNS_TYPE(ObjectPair, Name)
 #define RUNTIME_FUNCTION_RETURN_TRIPLE(Name) \
     RUNTIME_FUNCTION_RETURNS_TYPE(ObjectTriple, Name)
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ARGUMENTS_H_