Cross Reference: /external/perf_data_converter/src/quipper/compat

`Name`	`Date`	`Size`
Up to higher level directory
`cros/`	22-Oct-2020
`log_level.cc`	22-Oct-2020	`403`
`log_level.h`	22-Oct-2020	`657`
`non_cros/`	22-Oct-2020
`proto.h`	22-Oct-2020	`1,021`
`string.h`	22-Oct-2020	`402`
`test.h`	22-Oct-2020	`349`
`thread.h`	22-Oct-2020	`1.5K`