Fix WebRTC transport to use single offer-answer exchange instead of two.

remoting/protocol/connection_to_client.h

Index: remoting/protocol/connection_to_client.h
diff --git a/remoting/protocol/connection_to_client.h b/remoting/protocol/connection_to_client.h
index acb48b5b91ac5ebad6dc1394eeffd7d8af4ccb63..30216ba8006215b0d87d91f35414cd44e7a4b624 100644
--- a/remoting/protocol/connection_to_client.h
+++ b/remoting/protocol/connection_to_client.h
@@ -41,6 +41,10 @@ class ConnectionToClient {
     // Called when the network connection is authenticated.
     virtual void OnConnectionAuthenticated(ConnectionToClient* connection) = 0;
 
+    // Called to request creation of video streams. May be called before or
+    // after OnConnectionChannelsConnected().
+    virtual void CreateVideoStreams(ConnectionToClient* connection) = 0;
+
     // Called when the network connection is authenticated and all
     // channels are connected.
     virtual void OnConnectionChannelsConnected(