Adding IceConfig option to assume TURN/TURN candidate pairs will work.

webrtc/p2p/base/transport.h

 /*
  *  Copyright 2004 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.
  */
 
@@ skipping 134 matching lines @@
 // TODO(hta): Consider if a simple vector is as good as a map.
 typedef std::vector<TransportChannelStats> TransportChannelStatsList;
 
 // Information about the stats of a transport.
 struct TransportStats {
   std::string transport_name;
   TransportChannelStatsList channel_stats;
 };
 
 // Information about ICE configuration.
+// TODO(deadbeef): Use rtc::Optional to represent unset values, instead of
+// -1.
 struct IceConfig {
   // The ICE connection receiving timeout value in milliseconds.
   int receiving_timeout = -1;
   // Time interval in milliseconds to ping a backup connection when the ICE
   // channel is strongly connected.
   int backup_connection_ping_interval = -1;
   // If true, the most recent port allocator session will keep on running.
   bool gather_continually = false;
 
   // Whether we should prioritize Relay/Relay candidate when nothing
   // is writable yet.
   bool prioritize_most_likely_candidate_pairs = false;
 
   // Writable connections are pinged at a slower rate once stablized.
   int stable_writable_connection_ping_interval = -1;
 
+  // If set to true, this means the ICE transport should presume TURN-to-TURN
+  // candidate pairs will succeed, even before a binding response is received.
+  bool presume_writable_when_fully_relayed = false;
+
   IceConfig() {}
   IceConfig(int receiving_timeout_ms,
             int backup_connection_ping_interval,
             bool gather_continually,
             bool prioritize_most_likely_candidate_pairs,
-            int stable_writable_connection_ping_interval_ms)
+            int stable_writable_connection_ping_interval_ms,
+            bool presume_writable_when_fully_relayed)
       : receiving_timeout(receiving_timeout_ms),
         backup_connection_ping_interval(backup_connection_ping_interval),
         gather_continually(gather_continually),
         prioritize_most_likely_candidate_pairs(
             prioritize_most_likely_candidate_pairs),
         stable_writable_connection_ping_interval(
-            stable_writable_connection_ping_interval_ms) {}
+            stable_writable_connection_ping_interval_ms),
+        presume_writable_when_fully_relayed(
+            presume_writable_when_fully_relayed) {}
 };
 
 bool BadTransportDescription(const std::string& desc, std::string* err_desc);
 
 bool IceCredentialsChanged(const std::string& old_ufrag,
                            const std::string& old_pwd,
                            const std::string& new_ufrag,
                            const std::string& new_pwd);
 
 class Transport : public sigslot::has_slots<> {
@@ skipping 173 matching lines @@
 
   ChannelMap channels_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(Transport);
 };
 
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_BASE_TRANSPORT_H_