hbos 3fd31fe502 Fix TSAN race in webrtc::voe::Channel.
|transport_overhead_per_packet_| and |rtp_overhead_per_packet_| could
be read from and written to on different threads concurrently. This CL
introduces a lock to GUARD these variables.

NOTRY because master.tryserver.webrtc.linux_ubsan_vptr is broken, all
other tests pass.

BUG=webrtc:7231
NOTRY=True

Review-Url: https://codereview.webrtc.org/2710363003
Cr-Commit-Position: refs/heads/master@{#16900}
2017-02-28 13:43:16 +00:00
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