minyue 2b6707826e Cleaning up AEC metrics.
Current implementation of AEC metrics does not read nicely. It messes up between a noise-removed calculation and a raw calculation.

I tried to clean it up, in which, I stick to the raw calculation since the noise-removed version can show some problem when the noise is overestimated.

BUG=

Review URL: https://codereview.webrtc.org/1581183005

Cr-Commit-Position: refs/heads/master@{#12455}
2016-04-21 09:07:17 +00:00
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