henrik.lundin 541280a8ca Add thread annotations to AudioLevel
This is a follow-up to https://codereview.webrtc.org/2984473002/.

BUG=none
TBR=henrika@webrtc.org

Review-Url: https://codereview.webrtc.org/2998763002
Cr-Commit-Position: refs/heads/master@{#19306}
2017-08-10 12:01:21 +00:00
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