Adding CastRemotingSender for media remoting.

chrome/renderer/media/cast_transport_ipc.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/media/cast_transport_ipc.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/callback.h"
@@ skipping 23 matching lines @@
 CastTransportIPC::~CastTransportIPC() {
   Send(new CastHostMsg_Delete(channel_id_));
   if (CastIPCDispatcher::Get()) {
     CastIPCDispatcher::Get()->RemoveSender(channel_id_);
   }
 }
 
 void CastTransportIPC::InitializeStream(
     const media::cast::CastTransportRtpConfig& config,
     std::unique_ptr<media::cast::RtcpObserver> rtcp_observer) {
-  DCHECK(clients_.find(config.ssrc) == clients_.end());
-  clients_[config.ssrc] = std::move(rtcp_observer);
+  if (rtcp_observer) {
+    DCHECK(clients_.find(config.ssrc) == clients_.end());
+    clients_[config.ssrc] = std::move(rtcp_observer);
+  }
   Send(new CastHostMsg_InitializeStream(channel_id_, config));
 }
 
 void CastTransportIPC::InsertFrame(uint32_t ssrc,
                                    const media::cast::EncodedFrame& frame) {
   Send(new CastHostMsg_InsertFrame(channel_id_, ssrc, frame));
 }
 
 void CastTransportIPC::SendSenderReport(
     uint32_t ssrc,
@@ skipping 117 matching lines @@
   }
 }
 
 void CastTransportIPC::Send(IPC::Message* message) {
   if (CastIPCDispatcher::Get()) {
     CastIPCDispatcher::Get()->Send(message);
   } else {
     delete message;
   }
 }