Marina Ciocea adc4da30f4 [InsertableStreams] Fix video receiver simulcast.
Save the frame transformer set on unsignaled receivers, and set the
transformer when the ssrc becomes known.

Pass the receiver's ssrc on registering the transformed frame callback,
to associate separate frame transformer sinks for each receiver.

Bug: chromium:1065838

Bug: chromium:1065838
Change-Id: I2a214bdb6cb9a8012928a03f046f311c344370f8
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/173201
Commit-Queue: Marina Ciocea <marinaciocea@webrtc.org>
Reviewed-by: Tommi <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31051}
2020-04-11 12:04:24 +00:00
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