This wires the current degradation preference in the SDK, it will later be nullable in a follow up change once the native API supports it. Bug: webrtc:11164 Change-Id: I8324e6e0af996dfddfa07e3aff4ba242d9533388 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/161321 Commit-Queue: Florent Castelli <orphis@webrtc.org> Reviewed-by: Sami Kalliomäki <sakal@webrtc.org> Cr-Commit-Position: refs/heads/master@{#30170}