Adding thread annotations to NetEq4
Adding thread annotations to NetEq4

R=pbos@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/9959004

Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: dcc301be07e695ca81a2c3165f49037a68c2cb8d

sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc