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..e0b15b4c9c3dc3e7fab9cf9b8cd13f972073cae0 100644
--- a/webrtc/modules/video_coding/video_receiver.cc
+++ b/webrtc/modules/video_coding/video_receiver.cc
@@ -56,7 +56,8 @@ VideoReceiver::VideoReceiver(Clock* clock,
       pre_decode_image_callback_(NULL),
       _receiveStatsTimer(1000, clock_),
       _retransmissionTimer(10, clock_),
-      _keyRequestTimer(500, clock_) {
+      _keyRequestTimer(500, clock_),
+      received_first_frame_(false) {
   assert(clock_);
 #ifdef DEBUG_DECODER_BIT_STREAM
   _bitStreamBeforeDecoder = fopen("decoderBitStream.bit", "wb");
@@ -323,6 +324,13 @@ int32_t VideoReceiver::Decode(uint16_t maxWaitTimeMs) {
     }
   }
 #endif
+
+  if (!received_first_frame_) {
+    received_first_frame_ = true;
+    LOG(LS_INFO) << "Received first decodable video frame, complete = "
+                 << (frame->Complete() ? "true" : "false");
+  }
+
   const int32_t ret = Decode(*frame);
   _receiver.ReleaseFrame(frame);
   return ret;