Fix race in TraceLog::AddEventWithTimestamp

base/trace_event/trace_log.cc

Index: base/trace_event/trace_log.cc
diff --git a/base/trace_event/trace_log.cc b/base/trace_event/trace_log.cc
index 9bb7a8a3ad4cebdd116c2de1c090e19756d7f568..9ceaa2f747797dc1e049c8faf35209193acc7da9 100644
--- a/base/trace_event/trace_log.cc
+++ b/base/trace_event/trace_log.cc
@@ -1368,7 +1368,7 @@ TraceEventHandle TraceLog::AddTraceEventWithThreadIdAndTimestamp(
   ThreadTicks thread_now = ThreadNow();
 
   ThreadLocalEventBuffer* thread_local_event_buffer = nullptr;
-  if (enabled_modes_ & RECORDING_MODE) {
+  if (*category_group_enabled & RECORDING_MODE) {
     // |thread_local_event_buffer_| can be null if the current thread doesn't
     // have a message loop or the message loop is blocked.
     InitializeThreadLocalEventBufferIfSupported();