Add possibility to configure low/high QP thresholds based on resolution. Bug: none Change-Id: Iaa3168b77678bd74feb67295d7658c0140721231 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/141867 Reviewed-by: Sergey Silkin <ssilkin@webrtc.org> Commit-Queue: Åsa Persson <asapersson@webrtc.org> Cr-Commit-Position: refs/heads/master@{#28348}