Zach Stein 3ca452be48 Create an RtpEncodingParameters struct for each simulcast stream
The additional structs are not used anywhere yet.

Bug: webrtc:8653
Change-Id: I8b3891e7f8d92286ffd43ea6010258a5828fa3b8
Reviewed-on: https://webrtc-review.googlesource.com/35007
Commit-Queue: Zach Stein <zstein@webrtc.org>
Reviewed-by: Seth Hampson <shampson@webrtc.org>
Reviewed-by: Peter Thatcher <pthatcher@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21682}
2018-01-18 19:02:43 +00:00
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