This gives clients a way to create a SessionDescriptionInterface
from a parsed cricket::SessionDescription other than depending on
JsepSessionDescription.
Bug: webrtc:9544
Change-Id: I3eec87b24aa005e6cbc4a018ad452c0d6823435d
Reviewed-on: https://webrtc-review.googlesource.com/90382
Reviewed-by: Seth Hampson <shampson@webrtc.org>
Commit-Queue: Steve Anton <steveanton@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24105}