This patch adds support for sending zero video layer allocations
header extensions. This can be used to signal that a stream is
turned off.
Bug: webrtc:12000
Change-Id: Id18fbbff2216ca23179c58ef7bbe2ebea5e242af
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/212743
Commit-Queue: Jonas Oreland <jonaso@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33541}