message: Adds transport overhead to route changes in scenario tests.
  Cr-Commit-Position: refs/heads/master@{#30662}
diff: #include <vector>
  #include <memory>
  +#include "rtc_base/net_helper.h"
  #include "rtc_base/numerics/safe_minmax.h"
  namespace webrtc {
  @@ -114,6 +115,9 @@ void NetworkNodeTransport::Connect(EmulatedEndpoint* endpoint,
  receiver_address.ipaddr().v4AddressAsHostOrderInteger());
  route.remote_network_id = static_cast<uint16_t>(
  receiver_address.ipaddr().v4AddressAsHostOrderInteger());
  + route.packet_overhead = packet_overhead.bytes() +
  + receiver_address.ipaddr().overhead() +
  + cricket::kUdpHeaderSize;
  {
  // Only IPv4 address is supported.
  RTC_CHECK_EQ(receiver_address.family(), AF_INET);
  