This expose a new GetSupportedH265Level API for WebRTC external factories to calculate H.265 levels to be use for SDP negotation. Bug: webrtc:13485 Change-Id: Ib420da2b9b1b7af00129294be5b3efec172e8faf Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/345544 Commit-Queue: Sergey Silkin <ssilkin@webrtc.org> Reviewed-by: Philip Eliasson <philipel@webrtc.org> Reviewed-by: Sergey Silkin <ssilkin@webrtc.org> Cr-Commit-Position: refs/heads/main@{#42079}