Implement Turn/Turn first logic for connection selection.

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 129 matching lines @@
 // Information about ICE configuration.
 struct IceConfig {
   // The ICE connection receiving timeout value.
   // TODO(honghaiz): Remove suffix _ms to be consistent.
   int receiving_timeout_ms = -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;
+
+  // If the current best connection is both writable and receiving,
+  // then we will also try hard to make sure it is pinged at this rate
+  // (Default value is a little less than 2 * STRONG_PING_DELAY).
+  int max_strong_delay = -1;
+
+  IceConfig() {}
+  IceConfig(int receiving_timeout,
+            int backup_connection_ping_interval,
+            bool gather_continually,
+            bool prioritize_most_likely_candidate_pairs,
+            int max_strong_delay)
+      : receiving_timeout_ms(receiving_timeout),
+        backup_connection_ping_interval(backup_connection_ping_interval),
+        gather_continually(gather_continually),
+        prioritize_most_likely_candidate_pairs(
+            prioritize_most_likely_candidate_pairs),
+        max_strong_delay(max_strong_delay) {}
 };
 
 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 157 matching lines @@
 
   ChannelMap channels_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(Transport);
 };
 
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_BASE_TRANSPORT_H_