HasEnabledStateObserver  456 base/debug/trace_event_impl.h   bool HasEnabledStateObserver(EnabledStateObserver* listener) const;
HasEnabledStateObserver   51 base/debug/trace_event_memory_unittest.cc       TraceLog::GetInstance()->HasEnabledStateObserver(controller.get()));
HasEnabledStateObserver   43 base/debug/trace_event_system_stats_monitor_unittest.cc       TraceLog::GetInstance()->HasEnabledStateObserver(