This adds the framework support for the max_framerate parameter. It doesn't implement it in any encoder yet. Bug: webrtc:11117 Change-Id: I329624cc0205c828498d3623a2e13dd3f97e1629 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/160184 Reviewed-by: Steve Anton <steveanton@webrtc.org> Reviewed-by: Erik Språng <sprang@webrtc.org> Reviewed-by: Åsa Persson <asapersson@webrtc.org> Commit-Queue: Florent Castelli <orphis@webrtc.org> Cr-Commit-Position: refs/heads/master@{#29907}