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Enable tracking of the level of clockdrift seen by the WebRTC acoustic
echo canceller. The histogram has three bins:
0: No clockdrift detected.
1: Clockdrift probable.
2: Clockdrift detected.

Bug: webrtc:10014
Change-Id: Ide08da65177cc0fe32c96fcad19d87d6ab8c7dc5
Reviewed-on: https://chromium-review.googlesource.com/c/1341919Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Gustaf Ullberg <gustaf@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610797}