This unconditionally limits usage of VP9 SVC inter-layer prediction to
frames of key picture.
Ideally we would like to let an application to configure SVC options.
But currently there is no API for this.
Bug: none
Change-Id: I21a84dafc946be122514d5b6bf327b65251f1115
Reviewed-on: https://webrtc-review.googlesource.com/76640
Commit-Queue: Sergey Silkin <ssilkin@webrtc.org>
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23224}