which allows determining what codec (data format) is used. Chromium CL: https://chromium-review.googlesource.com/c/chromium/src/+/4941907 Split from https://webrtc-review.googlesource.com/c/src/+/318283 to reduce CL size and avoid audio woes. BUG=webrtc:15579 Change-Id: I404107af526df3009c16d2a6148784fe87dfa807 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/323721 Reviewed-by: Tony Herre <herre@google.com> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Philipp Hancke <phancke@microsoft.com> Cr-Commit-Position: refs/heads/main@{#41007}