This CL introduces a different rampup behavir for the call startup and after resets that may occur due to delay changes, clock-drift and audio path glitches. Bug: chromium:819111, webrtc:8979 Change-Id: Ied1d7896be7f0c69aa6deb61475117021ca6ab09 Reviewed-on: https://webrtc-review.googlesource.com/60002 Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org> Reviewed-by: Jesus de Vicente Pena <devicentepena@webrtc.org> Commit-Queue: Per Åhgren <peah@webrtc.org> Cr-Commit-Position: refs/heads/master@{#22312}