This is in preparation for adding a gn target for audio_device_tests. BUG=webrtc:6170,webrtc:163 NOTRY=True Review-Url: https://codereview.webrtc.org/2222563002 Cr-Commit-Position: refs/heads/master@{#13768}
BUG=webrtc:4690 Review URL: https://codereview.webrtc.org/1844843003 Cr-Commit-Position: refs/heads/master@{#12220}