4f15ca5d74
It eliminates the need for hardcoded enumerations of the supported presets. Hopefully it enables us to support slightly bigger set of resolutions and make the code slightly cleaner. BUG=webrtc:6355 Review-Url: https://codereview.webrtc.org/2349223002 Cr-Commit-Position: refs/heads/master@{#14547}