Add logging of host lookups made by TurnPort to the RtcEventLog.

webrtc/logging/rtc_event_log/rtc_event_log2text.cc

 /*
  *  Copyright (c) 2017 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 548 matching lines @@
             break;
           case webrtc::rtcp::Psfb::kPacketType:
             PrintPsFeedback(parsed_stream, rtcp_block, log_timestamp,
                             direction);
             break;
           default:
             break;
         }
       }
     }
+    if (parsed_stream.GetEventType(i) ==
+        webrtc::ParsedRtcEventLog::HOST_LOOKUP_EVENT) {
+      int error;
+      int64_t elapsed_ms;
+      parsed_stream.GetHostLookup(i, &error, &elapsed_ms);
+      std::cout << parsed_stream.GetTimestamp(i)
+                << "\tHOST_LOOKUP"
+                << "\terror=" << error
+                << "\telapsed_ms=" << elapsed_ms
+                << std::endl;
+    }
   }
   return 0;
 }