waitable_event_for_testing_  882 base/debug/trace_event_impl.cc   WaitableEvent waitable_event_for_testing_;
waitable_event_for_testing_  902 base/debug/trace_event_impl.cc     waitable_event_for_testing_.Signal();
waitable_event_for_testing_  954 base/debug/trace_event_impl.cc   waitable_event_for_testing_.Wait();