Cross Reference: /build/soong/ui/tracer

`Name`	`Date`	`Size`
Up to higher level directory
`Android.bp`	21-Aug-2018	`822`
`microfactory.go`	21-Aug-2018	`1.7K`
`ninja.go`	21-Aug-2018	`3.1K`
`tracer.go`	21-Aug-2018	`5.5K`