This CL uses |width| and |height| in RTPVideoHeaderVP9 to pass information about enabled layers from encoder to packetizer. Bug: webrtc:11319 Change-Id: Idc1c337f8dfb3f7631506acb784d2a634b41b955 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/167724 Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Niels Moller <nisse@webrtc.org> Commit-Queue: Ilya Nikolaevskiy <ilnik@webrtc.org> Cr-Commit-Position: refs/heads/master@{#30428}