Enable webrtc::VideoFrame to store a reference to an encoded frame.
Bug: chromium:1013590
Change-Id: Id5a06f1c7249f104dfd328f08677cf8001958f0d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/158788
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Commit-Queue: Markus Handell <handellm@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29809}