Adds WebRtcAudioTrack.setSpeakerMute() API

BUG=NONE

Review-Url: https://codereview.webrtc.org/2025423003
Cr-Original-Commit-Position: refs/heads/master@{#13029}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: b50e84509f119b273301e4ad5191ef25e8dd9d14
2 files changed