pbos 18ad1d4008 Derive current layer from TL frame config.
Partially removes "current frame" state from TemporalLayers, aiming to
tie more state to the frame config being encoded. This is necessary for
having several outstanding frames being encoded.

Also renames several structs, since TemporalReferences contains more
than references it's renamed TemporalLayers::FrameConfig.

BUG=chromium:702017, webrtc:7349
R=sprang@webrtc.org

Review-Url: https://codereview.webrtc.org/2853073004
Cr-Commit-Position: refs/heads/master@{#18012}
2017-05-04 12:04:46 +00:00
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