Reland "Reland "Propagate media transport to media channel.""

This is a reland of da65ed2adcfa57ff3288ce01c1602c973fcab00d

Original change's description:
> Reland "Propagate media transport to media channel."
>
> This reverts commit 37cf2455a420124b341ad06ac27fa3c4dbd29d3c.
>
> Reason for revert: <INSERT REASONING HERE>
>
> Original change's description:
> > Revert "Propagate media transport to media channel."
> >
> > This reverts commit 8c16f745ab92cb6d305283e87fa8a661ae500ce4.
> >
> > Reason for revert: Breaks downstream project
> >
> > Original change's description:
> > > Propagate media transport to media channel.
> > >
> > > 1. Pass media transport factory to JSEP transport controller.
> > > 2. Pass media transport to voice media channel.
> > > 3. Add basic unit test that make sure if peer connection is created with media transport, it is propagated to voice media channel.
> > >
> > > Change-Id: Ie922db78ade0efd893e019cd2b4441a9947a2f71
> > > Bug: webrtc:9719
> > > Reviewed-on: https://webrtc-review.googlesource.com/c/105542
> > > Reviewed-by: Steve Anton <steveanton@webrtc.org>
> > > Reviewed-by: Niels Moller <nisse@webrtc.org>
> > > Reviewed-by: Peter Slatala <psla@webrtc.org>
> > > Commit-Queue: Anton Sukhanov <sukhanov@google.com>
> > > Cr-Commit-Position: refs/heads/master@{#25152}
> >
> > TBR=steveanton@webrtc.org,nisse@webrtc.org,psla@webrtc.org,sukhanov@google.com
> >
> > # Not skipping CQ checks because original CL landed > 1 day ago.
> >
> > Bug: webrtc:9719
> > Change-Id: Ic78cdc142a2145682ad74eac8b72c71c50f0a5c1
> > Reviewed-on: https://webrtc-review.googlesource.com/c/105840
> > Reviewed-by: Oleh Prypin <oprypin@webrtc.org>
> > Commit-Queue: Oleh Prypin <oprypin@webrtc.org>
> > Cr-Commit-Position: refs/heads/master@{#25154}
>
> TBR=steveanton@webrtc.org,oprypin@webrtc.org,nisse@webrtc.org,sukhanov@webrtc.org,psla@webrtc.org,sukhanov@google.com
>
> Change-Id: I505ff3451eae81573531faef155ff35d7f894022
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: webrtc:9719
> Reviewed-on: https://webrtc-review.googlesource.com/c/106500
> Reviewed-by: Anton Sukhanov <sukhanov@webrtc.org>
> Commit-Queue: Anton Sukhanov <sukhanov@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#25220}

Bug: webrtc:9719
Tbr: Steve Anton <steveanton@webrtc.org>
Tbr: Niels Moller <nisse@webrtc.org>
Change-Id: Ib45691ba8be9abb89ff8c6dac1861bdf59be4c8d
Reviewed-on: https://webrtc-review.googlesource.com/c/106561
Commit-Queue: Anton Sukhanov <sukhanov@webrtc.org>
Reviewed-by: Peter Slatala <psla@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25240}

pc/channelmanager.cc

diff --git a/pc/channelmanager.cc b/pc/channelmanager.cc
index 3ef9a42..e976cbc 100644
--- a/pc/channelmanager.cc
+++ b/pc/channelmanager.cc
@@ -156,6 +156,7 @@
     webrtc::Call* call,
     const cricket::MediaConfig& media_config,
     webrtc::RtpTransportInternal* rtp_transport,
+    webrtc::MediaTransportInterface* media_transport,
     rtc::Thread* signaling_thread,
     const std::string& content_name,
     bool srtp_required,
@@ -164,8 +165,8 @@
   if (!worker_thread_->IsCurrent()) {
     return worker_thread_->Invoke<VoiceChannel*>(RTC_FROM_HERE, [&] {
       return CreateVoiceChannel(call, media_config, rtp_transport,
-                                signaling_thread, content_name, srtp_required,
-                                crypto_options, options);
+                                media_transport, signaling_thread, content_name,
+                                srtp_required, crypto_options, options);
     });
   }
 
@@ -187,7 +188,7 @@
       absl::WrapUnique(media_channel), content_name, srtp_required,
       crypto_options);
 
-  voice_channel->Init_w(rtp_transport);
+  voice_channel->Init_w(rtp_transport, media_transport);
 
   VoiceChannel* voice_channel_ptr = voice_channel.get();
   voice_channels_.push_back(std::move(voice_channel));
@@ -253,7 +254,9 @@
       worker_thread_, network_thread_, signaling_thread,
       absl::WrapUnique(media_channel), content_name, srtp_required,
       crypto_options);
-  video_channel->Init_w(rtp_transport);
+
+  // TODO(sukhanov): Add media_transport support for video channel.
+  video_channel->Init_w(rtp_transport, /*media_transport=*/nullptr);
 
   VideoChannel* video_channel_ptr = video_channel.get();
   video_channels_.push_back(std::move(video_channel));