// TODO(mknyszek): Extend procRangeGenerator to support rendering proc ranges
	// that overlap with a goroutine's execution.
}

func (g *goroutineGenerator) ProcTransition(ctx *traceContext, ev *trace.Event) {
	// Not needed. All relevant information for goroutines can be derived from goroutine transitions.
}

func (g *goroutineGenerator) Finish(ctx *traceContext) {

	GoroutineRange(ctx *traceContext, ev *trace.Event)
	GoroutineTransition(ctx *traceContext, ev *trace.Event)

	// Proc parts.
	ProcRange(ctx *traceContext, ev *trace.Event)
	ProcTransition(ctx *traceContext, ev *trace.Event)

	// User annotations.
	Log(ctx *traceContext, ev *trace.Event)

	// Finish indicates the end of the trace and finalizes generation.
	Finish(ctx *traceContext)
}

	_, inMarkAssist := gs.activeRanges["GC mark assist"]
	ctx.GoroutineTransition(ctx.elapsed(ev.Time()), viewerGState(from, inMarkAssist), viewerGState(to, inMarkAssist))
}

func (g *threadGenerator) ProcTransition(ctx *traceContext, ev *trace.Event) {
	if ev.Thread() != trace.NoThread {
		if _, ok := g.threads[ev.Thread()]; !ok {
			g.threads[ev.Thread()] = struct{}{}
		}
	}

	type procArg struct {

	_, inMarkAssist := gs.activeRanges["GC mark assist"]
	ctx.GoroutineTransition(ctx.elapsed(ev.Time()), viewerGState(from, inMarkAssist), viewerGState(to, inMarkAssist))
}

func (g *procGenerator) ProcTransition(ctx *traceContext, ev *trace.Event) {
	st := ev.StateTransition()
	proc := st.Resource.Proc()

	g.maxProc = max(g.maxProc, proc)
	viewerEv := traceviewer.InstantEvent{
		Resource: uint64(proc),