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

webrtc/logging/rtc_event_log/rtc_event_log_unittest_helper.cc

Index: webrtc/logging/rtc_event_log/rtc_event_log_unittest_helper.cc
diff --git a/webrtc/logging/rtc_event_log/rtc_event_log_unittest_helper.cc b/webrtc/logging/rtc_event_log/rtc_event_log_unittest_helper.cc
index 9d98855d4af9deda2b4b85da37ef9f9965b41474..ebdff03ab12825636daf1382768797b153de63f7 100644
--- a/webrtc/logging/rtc_event_log/rtc_event_log_unittest_helper.cc
+++ b/webrtc/logging/rtc_event_log/rtc_event_log_unittest_helper.cc
@@ -570,4 +570,20 @@ void RtcEventLogTestHelper::VerifyProbeResultFailure(
   // 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