Telling the encoder to adjust the parameters for the screen content.
Also, telling the encoder to skip the encoding of very flat/low content blocks. For now only for screensharing. (number 8 in VP8E_SET_STATIC_THRESHOLD is correct)
Review URL: https://codereview.webrtc.org/1308753006
Cr-Commit-Position: refs/heads/master@{#9860}