to convert flags which chains a video frame part of into chain_diffs
Bug: webrtc:10342
Change-Id: I6fb899eae934078223b101c9f85e2ac101980d4c
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/175108
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31306}
