Added log messages for important call setup events: first packet sent/received

webrtc/modules/rtp_rtcp/source/rtp_receiver_video.cc

Index: webrtc/modules/rtp_rtcp/source/rtp_receiver_video.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_receiver_video.cc b/webrtc/modules/rtp_rtcp/source/rtp_receiver_video.cc
index 406acc23c2039c8fdb61e41fe8f0151e802f3725..72fb1b2defe203a9b2999b1e4840d795dc8baa4c 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_receiver_video.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_receiver_video.cc
@@ -70,6 +70,10 @@ int32_t RTPReceiverVideo::ParseRtpPacket(WebRtcRTPHeader* rtp_header,
                                                                            : -1;
   }
 
+  if (first_packet_received_()) {
+    LOG(LS_INFO) << "Received first video RTP packet";
+  }
+
   // We are not allowed to hold a critical section when calling below functions.
   rtc::scoped_ptr<RtpDepacketizer> depacketizer(
       RtpDepacketizer::Create(rtp_header->type.Video.codec));