minyue 223641f1b9 Reland "Move smoothing filter to common audio".
The original CL was this https://codereview.webrtc.org/2484153002/

Due to failure with internal trial servers, it was reverted. This CL tries to reland it.

BUG=webrtc:6443

Review-Url: https://codereview.webrtc.org/2520003005
Cr-Commit-Position: refs/heads/master@{#15227}
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