to extract byte representation of a built extension without rebuilding it.
Bug: webrtc:9361
Change-Id: I5e2a5caeb8ff28dcb58dc25d53407c449c86df44
Reviewed-on: https://webrtc-review.googlesource.com/102940
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24925}