Add send transports to individual webrtc::Call streams.

webrtc/video/transport_adapter.cc

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "webrtc/video/transport_adapter.h"
 
+#include "webrtc/base/checks.h"
+
 namespace webrtc {
 namespace internal {
 
 TransportAdapter::TransportAdapter(newapi::Transport* transport)
-    : transport_(transport), enabled_(0) {}
+    : transport_(transport), enabled_(0) {
+  DCHECK(nullptr != transport);
+}
 
 int TransportAdapter::SendPacket(int /*channel*/,
                                  const void* packet,
                                  size_t length) {
   if (enabled_.Value() == 0)
     return false;
 
   bool success = transport_->SendRtp(static_cast<const uint8_t*>(packet),
                                      length);
   return success ? static_cast<int>(length) : -1;
@@ skipping 13 matching lines @@
 void TransportAdapter::Enable() {
   // If this exchange fails it means enabled_ was already true, no need to
   // check result and iterate.
   enabled_.CompareExchange(1, 0);
 }
 
 void TransportAdapter::Disable() { enabled_.CompareExchange(0, 1); }
 
 }  // namespace internal
 }  // namespace webrtc