
Added unittest. This setting allows for dynamic resizing at low bitrates. Setting is off by default for now. BUG= R=mflodman@webrtc.org, stefan@webrtc.org TBR=stefan@webrtc.org Review URL: https://codereview.webrtc.org/1323943007 . Cr-Commit-Position: refs/heads/master@{#9976}