Force a memcpy directly from the AEC ring buffer.
Force a memcpy directly from the AEC ring buffer.

Review URL: https://webrtc-codereview.appspot.com/1140004

Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 9fbd9ca84915e76f86d988bfa653006aa761ec80

sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc