For consistency with the VP9 RTP spec which uses term "picture" for set of frames which belong to the same time instance. Bug: none Change-Id: I30e92d5debb008feb58f770b63fe10c2e0029267 Reviewed-on: https://webrtc-review.googlesource.com/72180 Reviewed-by: Sami Kalliomäki <sakal@webrtc.org> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Åsa Persson <asapersson@webrtc.org> Commit-Queue: Sergey Silkin <ssilkin@webrtc.org> Cr-Commit-Position: refs/heads/master@{#23040}