Cross Reference: /external/webrtc/webrtc/modules/audio_device/mac/portaudio

`Name`	`Date`	`Size`
Up to higher level directory
`pa_memorybarrier.h`	05-Oct-2017	`5.7K`
`pa_ringbuffer.c`	05-Oct-2017	`9.7K`
`pa_ringbuffer.h`	05-Oct-2017	`8.4K`