Add plumbing of RtpPacketInfos to each AudioFrame as input for SourceTracker.

This change adds the plumbing of RtpPacketInfo from ChannelReceive::OnRtpPacket() to ChannelReceive::GetAudioFrameWithInfo() for audio. It is a step towards replacing the non-spec compliant ContributingSources that updates itself at packet-receive time, with the spec-compliant SourceTracker that will update itself at frame-delivery-to-track time.

Bug: webrtc:10668
Change-Id: I03385d6865bbc7bfbef7634f88de820a934f787a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/139890
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Reviewed-by: Minyue Li <minyue@webrtc.org>
Commit-Queue: Chen Xing <chxg@google.com>
Cr-Commit-Position: refs/heads/master@{#28434}

modules/audio_coding/neteq/packet.cc

@@ -28,6 +28,7 @@ Packet Packet::Clone() const {
   clone.payload_type = payload_type;
   clone.payload.SetData(payload.data(), payload.size());
   clone.priority = priority;
+  clone.packet_info = packet_info;
 
   return clone;
 }