Method timer

fdbrpc/sim2.actor.cpp:894–897

timer() can be up to 0.1 seconds ahead of now()

	// timer() can be up to 0.1 seconds ahead of now()
	double timer() override {
		timerTime += deterministicRandom()->random01() * (time + 0.1 - timerTime) / 2.0;
		return timerTime;
	}

	double timer_monotonic() override { return timer(); }