Update libjingle to 50191337.

R=mallinath@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1885005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4461 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/talk/media/base/mediachannel.h b/talk/media/base/mediachannel.h
index 07d5f90..a9e3778 100644
--- a/talk/media/base/mediachannel.h
+++ b/talk/media/base/mediachannel.h
@@ -957,6 +957,9 @@
   // Signal errors from MediaChannel.  Arguments are:
   //     ssrc(uint32), and error(DataMediaChannel::Error).
   sigslot::signal2<uint32, DataMediaChannel::Error> SignalMediaError;
+  // Signal when the media channel is ready to send the stream. Arguments are:
+  //     writable(bool)
+  sigslot::signal1<bool> SignalReadyToSend;
 };
 
 }  // namespace cricket