Danil Chapovalov a13e7a1d46 Add factory to create scalability structures by name
according to webrtc-svc spec draft

Bug: webrtc:11404
Change-Id: I318b8a1a5c5389f6e5d15c3dd7d93041459e37f9
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/178603
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31731}
2020-07-15 10:26:40 +00:00
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