This helps a lot to avoid reducing the bitrate too quickly when there's a short period of very few packets delivered, followed by the rate resuming at the regular rate. It specifically avoids the BWE going down to super low values as a response delay spikes.
BUG=webrtc:6566
R=terelius@webrtc.org
Review URL: https://codereview.webrtc.org/2422063002 .
Cr-Commit-Position: refs/heads/master@{#14802}