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(
+    const ParsedRtcEventLog& parsed_log,
+    size_t index,
+    int error,
+    int64_t host_lookup_time_ms) {
+  const rtclog::Event& event = parsed_log.events_[index];
+  ASSERT_TRUE(IsValidBasicEvent(event));
+  EXPECT_EQ(rtclog::Event::HOST_LOOKUP_EVENT, event.type());
+
+  const rtclog::HostLookupResult& lookup_event = event.host_lookup_result();
+  ASSERT_TRUE(lookup_event.has_error());
+  ASSERT_EQ(lookup_event.error(), error);
+  ASSERT_TRUE(lookup_event.has_host_lookup_time_ms());
+  ASSERT_EQ(lookup_event.host_lookup_time_ms(), host_lookup_time_ms);

[terelius, 2017/08/21 09:38:14]

In addition to this code, could you also read the error and lookup_time using
the parser?

+}
+
 }  // namespace webrtc