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..ed72edf02496534836af06d0cfb418de8d4adb66 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 +570,12 @@ void RtcEventLogTestHelper::VerifyProbeResultFailure(
   // 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