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

webrtc/logging/rtc_event_log/rtc_event_log_unittest_helper.cc

 /*
  *  Copyright (c) 2016 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 552 matching lines @@
   const rtclog::BweProbeResult& bwe_event = event.probe_result();
   ASSERT_TRUE(bwe_event.has_id());
   EXPECT_EQ(id, bwe_event.id());
   ASSERT_TRUE(bwe_event.has_result());
   EXPECT_EQ(GetProbeResultType(failure_reason), bwe_event.result());
   ASSERT_FALSE(bwe_event.has_bitrate_bps());
 
   // TODO(philipel): Verify the parser when parsing has been implemented.
 }
 
+void RtcEventLogTestHelper::VerifyLogHostLookupEvent(

[terelius, 2017/08/18 11:41:33]

You should also test that the error code and elapsed_time are written correctly.
If you add a method to the parser, e.g. GetHostLookup(size_t index, int* error,
int64_t* elapsed_time),  then you might want to also test the consistency of
that here.

+    const ParsedRtcEventLog& parsed_log,
+    size_t index) {
+  const rtclog::Event& event = parsed_log.events_[index];
+  ASSERT_TRUE(IsValidBasicEvent(event));
+  EXPECT_EQ(rtclog::Event::HOST_LOOKUP_EVENT, event.type());
+}
+
 }  // namespace webrtc