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by creating an id collision and letting UsedIds resolve it. Also avoid id=15 which is forbidden by https://www.rfc-editor.org/rfc/rfc8285#section-4.2 so might cause interop issues in offers to implementations not supporting two-byte extensions. BUG=webrtc:15378 Change-Id: I27926f065f8e396257294da7acf2be9802169805 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/319280 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Reviewed-by: Henrik Boström <hbos@webrtc.org> Commit-Queue: Philipp Hancke <phancke@microsoft.com> Cr-Commit-Position: refs/heads/main@{#41696}