Log audio network adapter decisions in event log.

webrtc/logging/rtc_event_log/mock/mock_rtc_event_log.h

Index: webrtc/logging/rtc_event_log/mock/mock_rtc_event_log.h
diff --git a/webrtc/logging/rtc_event_log/mock/mock_rtc_event_log.h b/webrtc/logging/rtc_event_log/mock/mock_rtc_event_log.h
index 315967b8c0a7c30f31fc9d710bdf12751e0e53d8..c461db23a37a62650a7ae044260acb4dd97952e4 100644
--- a/webrtc/logging/rtc_event_log/mock/mock_rtc_event_log.h
+++ b/webrtc/logging/rtc_event_log/mock/mock_rtc_event_log.h
@@ -58,6 +58,13 @@ class MockRtcEventLog : public RtcEventLog {
                void(int32_t bitrate,
                     uint8_t fraction_loss,
                     int32_t total_packets));
+  MOCK_METHOD6(LogAnaDecisionEvent,

[the sun, 2016/12/13 16:31:18]

So basically, this function is here to log 6 different events? Hmm...

[michaelt, 2016/12/14 14:41:37]

Would you prefer to log each event separated. I implemented it this way to give
the log some structure. 

[minyue-webrtc, 2016/12/16 13:50:31]

No, I don't agree. if you pass the proto event as input, it still have
structure. The log method does not need to know the content of it any longer.

Imagine we add other controllers in the future.

[michaelt, 2016/12/20 09:29:55]

After a offline discussion, minyue and me agreed on passing EncoderRuntimeConfig
to this log function. 

+               void(rtc::Optional<int> bitrate_bps,
+                    rtc::Optional<int> frame_length_ms,
+                    rtc::Optional<float> uplink_packet_loss_fraction,
+                    rtc::Optional<bool> enable_fec,
+                    rtc::Optional<bool> enable_dtx,
+                    rtc::Optional<size_t> num_channels));
 };
 
 }  // namespace webrtc