This CL changes the threshold where we consider a block to be static and
of sufficient quality to not spend bits/CPU encoding it.
Perf note: This change may result in a minor degradation of PSNR/SSIM
and available send bitrate. CPU usage and bitrate sent should however
be greately reduced.
BUG=webrtc:5015
Review URL: https://codereview.webrtc.org/1383533002
Cr-Commit-Position: refs/heads/master@{#10134}
fb30c1b5d1