Cross Reference: /build/make/tools/atree

`Name`	`Date`	`Size`
Up to higher level directory
`Android.bp`	22-Oct-2020	`304`
`atree.cpp`	22-Oct-2020	`10.5K`
`files.cpp`	22-Oct-2020	`11.9K`
`files.h`	22-Oct-2020	`1K`
`fs.cpp`	22-Oct-2020	`5.3K`
`fs.h`	22-Oct-2020	`260`
`options.h`	22-Oct-2020	`244`