e6fe2a9a7f
Moves towards separating which layers may be referenced instead of referencing libvpx flags directly. This will make strategies easier to extract and usable from hardware encoders (RTCVideoEncoder, for instance). BUG=chromium:702017, webrtc:7349 R=brandtr@webrtc.org, marpan@webrtc.org. sprang@webrtc.org Review-Url: https://codereview.webrtc.org/2747123005 Cr-Commit-Position: refs/heads/master@{#17349}