skia helper for encoding video

Change-Id: I36aef5872fc8f5938854ab18b754f3800b9879ad
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/215165
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
6 files changed