Add logs when stun or turn host lookup is completed.

webrtc/p2p/base/stunport.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 354 matching lines @@
     resolver_.reset(new AddressResolver(socket_factory()));
     resolver_->SignalDone.connect(this, &UDPPort::OnResolveResult);
   }
 
   resolver_->Resolve(stun_addr);
 }
 
 void UDPPort::OnResolveResult(const rtc::SocketAddress& input,
                               int error) {
   ASSERT(resolver_.get() != NULL);
+  LOG_J(LS_INFO, this) << "STUN host lookup result " << error;

[pthatcher1, 2015/12/02 19:56:32]

I think that what we really want is a log just *before* we do the lookup. 
Otherwise, we wouldn't see anything in the logs for ones that take a really long
time.

And in that case, we probably only want to log failures, not successes.

[honghaiz3, 2015/12/02 23:45:30]

Done.

 
   rtc::SocketAddress resolved;
   if (error != 0 ||
       !resolver_->GetResolvedAddress(input, ip().family(), &resolved))  {
-    LOG_J(LS_WARNING, this) << "StunPort: stun host lookup received error "
-                            << error;
     OnStunBindingOrResolveRequestFailed(input);
     return;
   }
 
   server_addresses_.erase(input);
 
   if (server_addresses_.find(resolved) == server_addresses_.end()) {
     server_addresses_.insert(resolved);
     SendStunBindingRequest(resolved);
   }
@@ skipping 113 matching lines @@
   const std::vector<Candidate>& existing_candidates = Candidates();
   std::vector<Candidate>::const_iterator it = existing_candidates.begin();
   for (; it != existing_candidates.end(); ++it) {
     if (it->address() == addr)
       return true;
   }
   return false;
 }
 
 }  // namespace cricket