Pick the DTLS handshake timeout based on the ICE RTT estimate

webrtc/p2p/base/p2ptransportchannel.cc

 /*
  *  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 258 matching lines @@
     return;
   }
 
   tiebreaker_ = tiebreaker;
 }
 
 IceTransportState P2PTransportChannel::GetState() const {
   return state_;
 }
 
+rtc::Optional<int> P2PTransportChannel::GetRttEstimate() {
+  if (selected_connection_ != nullptr) {
+    return rtc::Optional<int>(selected_connection_->rtt());
+  } else {
+    return rtc::Optional<int>();
+  }
+}
+
 // A channel is considered ICE completed once there is at most one active
 // connection per network and at least one active connection.
 IceTransportState P2PTransportChannel::ComputeState() const {
   if (!had_connection_) {
     return IceTransportState::STATE_INIT;
   }
 
   std::vector<Connection*> active_connections;
   for (Connection* connection : connections_) {
     if (connection->active()) {
@@ skipping 1745 matching lines @@
 
 void P2PTransportChannel::set_receiving(bool receiving) {
   if (receiving_ == receiving) {
     return;
   }
   receiving_ = receiving;
   SignalReceivingState(this);
 }
 
 }  // namespace cricket