Reland of "Revert of Update the BWE when the network route changes.

webrtc/p2p/base/port.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 1507 matching lines @@
   return waiting > 2 * rtt();
 }
 
 ProxyConnection::ProxyConnection(Port* port,
                                  size_t index,
                                  const Candidate& remote_candidate)
     : Connection(port, index, remote_candidate) {}
 
 int ProxyConnection::Send(const void* data, size_t size,
                           const rtc::PacketOptions& options) {
-  if (write_state_ == STATE_WRITE_INIT || write_state_ == STATE_WRITE_TIMEOUT) {
+  if (!ReadyToSendMedia()) {
     error_ = EWOULDBLOCK;
     return SOCKET_ERROR;
   }
   stats_.sent_total_packets++;
   int sent = port_->SendTo(data, size, remote_candidate_.address(),
                            options, true);
   if (sent <= 0) {
     ASSERT(sent < 0);
     error_ = port_->GetError();
     stats_.sent_discarded_packets++;
   } else {
     send_rate_tracker_.AddSamples(sent);
   }
   return sent;
 }
 
 }  // namespace cricket