Adds logging in combination with restart of audio unit

BUG=
R=tkchin@webrtc.org

Review URL: https://codereview.webrtc.org/2083603002 .

Cr-Original-Commit-Position: refs/heads/master@{#13233}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 86eff72eecb16ddff3004a5b3a4c31375f8d597f