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

webrtc/modules/video_coding/video_receiver.cc

Index: webrtc/modules/video_coding/video_receiver.cc
diff --git a/webrtc/modules/video_coding/video_receiver.cc b/webrtc/modules/video_coding/video_receiver.cc
index 5aadcf91e0eb41a1f3ed8b244db7c0de9d186f77..136f7d7830816d1737906af590baffb4a0aad1a5 100644
--- a/webrtc/modules/video_coding/video_receiver.cc
+++ b/webrtc/modules/video_coding/video_receiver.cc
@@ -323,6 +323,13 @@ int32_t VideoReceiver::Decode(uint16_t maxWaitTimeMs) {
     }
   }
 #endif
+
+  if (first_frame_received_()) {
+    LOG(LS_INFO) << "Received first "
+                 << (frame->Complete() ? "complete" : "incomplete")
+                 << " decodable video frame";
+  }
+
   const int32_t ret = Decode(*frame);
   _receiver.ReleaseFrame(frame);
   return ret;