Add send transports to individual webrtc::Call streams.

webrtc/video/transport_adapter.cc

Index: webrtc/video/transport_adapter.cc
diff --git a/webrtc/video/transport_adapter.cc b/webrtc/video/transport_adapter.cc
index 7b5a6962c4483d19b3af13e1028e4f716480d2f3..abd9c1edb3cb46db2c031077af470849429f5f01 100644
--- a/webrtc/video/transport_adapter.cc
+++ b/webrtc/video/transport_adapter.cc
@@ -9,12 +9,15 @@
  */
 
 #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);

[pbos-webrtc, 2015/08/26 12:21:22]

pref transport != nullptr

[the sun, 2015/08/27 08:42:21]

Why? I usually write conditionals with a non-assignable operand (if any) on the
left to avoid bugs when '=' was used instead of '=='.

[pbos-webrtc, 2015/08/27 09:02:01]

Reads more like english "check that transport isn't null" vs "check that null
isn't transport". I won't hold you to it though. :)

+}
 
 int TransportAdapter::SendPacket(int /*channel*/,
                                  const void* packet,