Cross Reference: /external/perfetto/gn/standalone/toolchain

`Name`	`Date`	`Size`
Up to higher level directory
`BUILD.gn`	21-Aug-2018	`4.3K`
`linux_find_llvm.py`	21-Aug-2018	`1.3K`
`llvm.gni`	21-Aug-2018	`1.7K`
`mac_find_llvm.py`	21-Aug-2018	`1.2K`