This is a reland of commit 6c27d56a2aeb2cff10a216d714552f4970d99d32
avoiding the Fuchsia/C++17 compilation issues.
Original change's description:
> sdp: measure rtp header extension collisions
>
> since extension ids are required to be unique in a BUNDLE group:
> https://www.rfc-editor.org/rfc/rfc8843#name-rtp-header-extensions-consi
>
> Measure how much enforcing this would break in UMA first.
>
> BUG=webrtc:14782
>
> Change-Id: Ieaf7a436feea677032499e11ca14973eebda322e
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/288362
> Reviewed-by: Harald Alvestrand <hta@webrtc.org>
> Commit-Queue: Philipp Hancke <phancke@microsoft.com>
> Reviewed-by: Johannes Kron <kron@webrtc.org>
> Cr-Commit-Position: refs/heads/main@{#38914}
Bug: webrtc:14782
Change-Id: If9449b0381ebe33ba30eff0d733a1f3c94470d5d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/288383
Reviewed-by: Johannes Kron <kron@webrtc.org>
Commit-Queue: Philipp Hancke <phancke@microsoft.com>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#38919}
a2f5d45b81