85829fd90c
Permits going from HD to QVGA in 6 seconds instead of 10. Also adds windows for going up quickly in the beginning of a call (before any downscaling happens due to bad quality). BUG=webrtc:5678 R=glaznev@webrtc.org, stefan@webrtc.org Review URL: https://codereview.webrtc.org/1830593003 . Cr-Commit-Position: refs/heads/master@{#12219}